diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 0a1d9d5..169e054 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -978,9 +978,11 @@
     const int *ciphersuite_list[4]; /*!< allowed ciphersuites per version   */
 #endif /* MBEDTLS_SSL_CONF_SINGLE_CIPHERSUITE */
 
+#if defined(MBEDTLS_DEBUG_C)
     /** Callback for printing debug output                                  */
     void (*f_dbg)(void *, int, const char *, int, const char *);
     void *p_dbg;                    /*!< context for the debug function     */
+#endif /* MBEDTLS_DEBUG_C */
 
 #if !defined(MBEDTLS_SSL_CONF_RNG)
     /** Callback for getting (pseudo-)random numbers                        */
@@ -1579,6 +1581,7 @@
                                void *p_rng );
 #endif /* MBEDTLS_SSL_CONF_RNG */
 
+#if defined(MBEDTLS_DEBUG_C)
 /**
  * \brief          Set the debug callback
  *
@@ -1596,6 +1599,7 @@
 void mbedtls_ssl_conf_dbg( mbedtls_ssl_config *conf,
                   void (*f_dbg)(void *, int, const char *, int, const char *),
                   void  *p_dbg );
+#endif /* MBEDTLS_DEBUG_C */
 
 #if !defined(MBEDTLS_SSL_CONF_RECV) && \
     !defined(MBEDTLS_SSL_CONF_SEND) && \
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index e63c688..2a2d321 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -8221,6 +8221,7 @@
 }
 #endif
 
+#if defined(MBEDTLS_DEBUG_C)
 void mbedtls_ssl_conf_dbg( mbedtls_ssl_config *conf,
                   void (*f_dbg)(void *, int, const char *, int, const char *),
                   void  *p_dbg )
@@ -8228,6 +8229,7 @@
     conf->f_dbg      = f_dbg;
     conf->p_dbg      = p_dbg;
 }
+#endif /* MBEDTLS_DEBUG_C */
 
 #if !defined(MBEDTLS_SSL_CONF_RECV) && \
     !defined(MBEDTLS_SSL_CONF_SEND) && \
diff --git a/programs/ssl/dtls_client.c b/programs/ssl/dtls_client.c
index 700e197..5bd5cbe 100644
--- a/programs/ssl/dtls_client.c
+++ b/programs/ssl/dtls_client.c
@@ -83,6 +83,7 @@
 #define DEBUG_LEVEL 0
 
 
+#if defined(MBEDTLS_DEBUG_C)
 static void my_debug( void *ctx, int level,
                       const char *file, int line,
                       const char *str )
@@ -92,6 +93,7 @@
     mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
     fflush(  (FILE *) ctx  );
 }
+#endif /* MBEDTLS_DEBUG_C */
 
 int main( int argc, char *argv[] )
 {
@@ -191,7 +193,9 @@
     mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_OPTIONAL );
     mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
     mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+#if defined(MBEDTLS_DEBUG_C)
     mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+#endif
 
     if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
     {
diff --git a/programs/ssl/dtls_server.c b/programs/ssl/dtls_server.c
index e238a95..f2dcd2f 100644
--- a/programs/ssl/dtls_server.c
+++ b/programs/ssl/dtls_server.c
@@ -92,6 +92,7 @@
 #define DEBUG_LEVEL 0
 
 
+#if defined(MBEDTLS_DEBUG_C)
 static void my_debug( void *ctx, int level,
                       const char *file, int line,
                       const char *str )
@@ -101,6 +102,7 @@
     mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
     fflush(  (FILE *) ctx  );
 }
+#endif /* MBEDTLS_DEBUG_C */
 
 int main( void )
 {
@@ -223,7 +225,9 @@
     }
 
     mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+#if defined(MBEDTLS_DEBUG_C)
     mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+#endif
 
 #if defined(MBEDTLS_SSL_CACHE_C) && !defined(MBEDTLS_SSL_NO_SESSION_CACHE)
     mbedtls_ssl_conf_session_cache( &conf, &cache,
diff --git a/programs/ssl/ssl_client1.c b/programs/ssl/ssl_client1.c
index 28ecc21..2554946 100644
--- a/programs/ssl/ssl_client1.c
+++ b/programs/ssl/ssl_client1.c
@@ -73,6 +73,7 @@
 #define DEBUG_LEVEL 1
 
 
+#if defined(MBEDTLS_DEBUG_C)
 static void my_debug( void *ctx, int level,
                       const char *file, int line,
                       const char *str )
@@ -82,6 +83,7 @@
     mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
     fflush(  (FILE *) ctx  );
 }
+#endif /* MBEDTLS_DEBUG_C */
 
 int main( void )
 {
@@ -178,7 +180,9 @@
     mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_OPTIONAL );
     mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
     mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+#if defined(MBEDTLS_DEBUG_C)
     mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+#endif
 
     if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
     {
diff --git a/programs/ssl/ssl_client2.c b/programs/ssl/ssl_client2.c
index d9cfa25..205f27a 100644
--- a/programs/ssl/ssl_client2.c
+++ b/programs/ssl/ssl_client2.c
@@ -451,6 +451,7 @@
 
 int query_config( const char *config );
 
+#if defined(MBEDTLS_DEBUG_C)
 static void my_debug( void *ctx, int level,
                       const char *file, int line,
                       const char *str )
@@ -466,6 +467,7 @@
                      basename, line, level, str );
     fflush(  (FILE *) ctx  );
 }
+#endif /* MBEDTLS_DEBUG_C */
 
 
 #if !defined(MBEDTLS_SSL_CONF_RECV) && \
@@ -1778,7 +1780,9 @@
     mbedtls_ssl_conf_rng_ctx( &conf, &ctr_drbg );
 #endif
 
+#if defined(MBEDTLS_DEBUG_C)
     mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+#endif
 
 #if !defined(MBEDTLS_SSL_CONF_READ_TIMEOUT)
     mbedtls_ssl_conf_read_timeout( &conf, opt.read_timeout );
diff --git a/programs/ssl/ssl_fork_server.c b/programs/ssl/ssl_fork_server.c
index b4a5414..c716ca9 100644
--- a/programs/ssl/ssl_fork_server.c
+++ b/programs/ssl/ssl_fork_server.c
@@ -90,6 +90,7 @@
 #define DEBUG_LEVEL 0
 
 
+#if defined(MBEDTLS_DEBUG_C)
 static void my_debug( void *ctx, int level,
                       const char *file, int line,
                       const char *str )
@@ -99,6 +100,7 @@
     mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
     fflush(  (FILE *) ctx  );
 }
+#endif /* MBEDTLS_DEBUG_C */
 
 int main( void )
 {
@@ -195,7 +197,9 @@
     }
 
     mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+#if defined(MBEDTLS_DEBUG_C)
     mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+#endif
 
     mbedtls_ssl_conf_ca_chain( &conf, srvcert.next, NULL );
     if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )
diff --git a/programs/ssl/ssl_mail_client.c b/programs/ssl/ssl_mail_client.c
index 63a3a2d..11b682c 100644
--- a/programs/ssl/ssl_mail_client.c
+++ b/programs/ssl/ssl_mail_client.c
@@ -163,6 +163,7 @@
     int force_ciphersuite[2];   /* protocol/ciphersuite to use, or all      */
 } opt;
 
+#if defined(MBEDTLS_DEBUG_C)
 static void my_debug( void *ctx, int level,
                       const char *file, int line,
                       const char *str )
@@ -172,6 +173,7 @@
     mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
     fflush(  (FILE *) ctx  );
 }
+#endif /* MBEDTLS_DEBUG_C */
 
 static int do_handshake( mbedtls_ssl_context *ssl )
 {
@@ -619,7 +621,9 @@
     mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_OPTIONAL );
 
     mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+#if defined(MBEDTLS_DEBUG_C)
     mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+#endif
 
 #if !defined(MBEDTLS_SSL_CONF_SINGLE_CIPHERSUITE)
     if( opt.force_ciphersuite[0] != DFL_FORCE_CIPHER )
diff --git a/programs/ssl/ssl_pthread_server.c b/programs/ssl/ssl_pthread_server.c
index 11298a5..6ce4faa 100644
--- a/programs/ssl/ssl_pthread_server.c
+++ b/programs/ssl/ssl_pthread_server.c
@@ -433,7 +433,9 @@
     }
 
     mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+#if defined(MBEDTLS_DEBUG_C)
     mbedtls_ssl_conf_dbg( &conf, my_mutexed_debug, stdout );
+#endif
 
     /* mbedtls_ssl_cache_get() and mbedtls_ssl_cache_set() are thread-safe if
      * MBEDTLS_THREADING_C is set.
diff --git a/programs/ssl/ssl_server.c b/programs/ssl/ssl_server.c
index f5fcfda..849c14d 100644
--- a/programs/ssl/ssl_server.c
+++ b/programs/ssl/ssl_server.c
@@ -85,6 +85,7 @@
 #define DEBUG_LEVEL 0
 
 
+#if defined(MBEDTLS_DEBUG_C)
 static void my_debug( void *ctx, int level,
                       const char *file, int line,
                       const char *str )
@@ -94,6 +95,7 @@
     mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
     fflush(  (FILE *) ctx  );
 }
+#endif /* MBEDTLS_DEBUG_C */
 
 int main( void )
 {
@@ -211,7 +213,9 @@
     }
 
     mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+#if defined(MBEDTLS_DEBUG_C)
     mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+#endif
 
 #if defined(MBEDTLS_SSL_CACHE_C) && !defined(MBEDTLS_SSL_NO_SESSION_CACHE)
     mbedtls_ssl_conf_session_cache( &conf, &cache,
diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index deaee9a..160997a 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -583,6 +583,7 @@
 
 int query_config( const char *config );
 
+#if defined(MBEDTLS_DEBUG_C)
 static void my_debug( void *ctx, int level,
                       const char *file, int line,
                       const char *str )
@@ -597,6 +598,7 @@
     mbedtls_fprintf( (FILE *) ctx, "%s:%04d: |%d| %s", basename, line, level, str );
     fflush(  (FILE *) ctx  );
 }
+#endif /* MBEDTLS_DEBUG_C */
 
 
 #if !defined(MBEDTLS_SSL_CONF_RECV) && \
@@ -2584,7 +2586,9 @@
     mbedtls_ssl_conf_rng_ctx( &conf, &ctr_drbg );
 #endif
 
+#if defined(MBEDTLS_DEBUG_C)
     mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+#endif
 
 #if defined(MBEDTLS_SSL_CACHE_C)
     if( opt.cache_max != -1 )
diff --git a/programs/x509/cert_app.c b/programs/x509/cert_app.c
index 3fc093e..0656ce7 100644
--- a/programs/x509/cert_app.c
+++ b/programs/x509/cert_app.c
@@ -117,6 +117,7 @@
     int permissive;             /* permissive parsing                   */
 } opt;
 
+#if defined(MBEDTLS_DEBUG_C)
 static void my_debug( void *ctx, int level,
                       const char *file, int line,
                       const char *str )
@@ -126,6 +127,7 @@
     mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
     fflush(  (FILE *) ctx  );
 }
+#endif /* MBEDTLS_DEBUG_C */
 
 static int my_verify( void *data, mbedtls_x509_crt *crt, int depth, uint32_t *flags )
 {
@@ -423,7 +425,9 @@
             mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_NONE );
 
         mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+#if defined(MBEDTLS_DEBUG_C)
         mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+#endif
 
         if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
         {