diff --git a/library/debug.c b/library/debug.c
index 36510cd..158caf1 100644
--- a/library/debug.c
+++ b/library/debug.c
@@ -300,7 +300,7 @@
 }
 #endif /* MBEDTLS_BIGNUM_C */
 
-#if defined(MBEDTLS_X509_CRT_PARSE_C)
+#if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_X509_INFO)
 static void debug_print_pk( const mbedtls_ssl_context *ssl, int level,
                             const char *file, int line,
                             const char *text, const mbedtls_pk_context *pk )
@@ -395,7 +395,7 @@
         crt = crt->next;
     }
 }
-#endif /* MBEDTLS_X509_CRT_PARSE_C */
+#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_X509_INFO */
 
 #if defined(MBEDTLS_ECDH_C)
 static void mbedtls_debug_printf_ecdh_internal( const mbedtls_ssl_context *ssl,