diff --git a/include/mbedtls/md4.h b/include/mbedtls/md4.h
index ce703c0..e7accd4 100644
--- a/include/mbedtls/md4.h
+++ b/include/mbedtls/md4.h
@@ -30,7 +30,7 @@
 #define MBEDTLS_MD4_H
 
 #if !defined(MBEDTLS_CONFIG_FILE)
-#include "config.h"
+#include "mbedtls/config.h"
 #else
 #include MBEDTLS_CONFIG_FILE
 #endif