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,