diff --git a/include/mbedtls/sha256.h b/include/mbedtls/sha256.h
index d647398..1c59740 100644
--- a/include/mbedtls/sha256.h
+++ b/include/mbedtls/sha256.h
@@ -28,7 +28,7 @@
 #define MBEDTLS_SHA256_H
 
 #if !defined(MBEDTLS_CONFIG_FILE)
-#include "config.h"
+#include "mbedtls/config.h"
 #else
 #include MBEDTLS_CONFIG_FILE
 #endif