diff --git a/include/mbedtls/sha1.h b/include/mbedtls/sha1.h
index bb6ecf0..988d2f9 100644
--- a/include/mbedtls/sha1.h
+++ b/include/mbedtls/sha1.h
@@ -32,7 +32,7 @@
 #define MBEDTLS_SHA1_H
 
 #if !defined(MBEDTLS_CONFIG_FILE)
-#include "config.h"
+#include "mbedtls/config.h"
 #else
 #include MBEDTLS_CONFIG_FILE
 #endif