1 files changed, 6 insertions, 4 deletions
diff --git a/lib/md4.c b/lib/md4.c
index 1bdc9f367..b7ce26c79 100644
--- a/lib/md4.c
+++ b/lib/md4.c
@@ -37,9 +37,10 @@
 
 #include "curl_setup.h"
 
-/* NSS and OS/400 crypto library do not provide the MD4 hash algorithm, so
- * that we have a local implementation of it */
-#if defined(USE_NSS) || defined(USE_OS400CRYPTO)
+/* The NSS, OS/400 and sometimes mbed TLS crypto libraries do not provide the
+ * MD4 hash algorithm, so we have a local implementation of it */
+#if defined(USE_NSS) || defined(USE_OS400CRYPTO) || \
+    (defined(USE_MBEDTLS) && !defined(MBEDTLS_MD4_C))
 
 #include "curl_md4.h"
 #include "warnless.h"
@@ -302,4 +303,5 @@ void Curl_md4it(unsigned char *output, const unsigned char *input, size_t len)
   MD4_Update(&ctx, input, curlx_uztoui(len));
   MD4_Final(output, &ctx);
 }
-#endif /* defined(USE_NSS) || defined(USE_OS400CRYPTO) */
+#endif /* defined(USE_NSS) || defined(USE_OS400CRYPTO) ||
+    (defined(USE_MBEDTLS) && !defined(MBEDTLS_MD4_C)) */