diff --git a/include/mbedtls/arc4.h b/include/mbedtls/arc4.h
index fb044d5..acad623 100644
--- a/include/mbedtls/arc4.h
+++ b/include/mbedtls/arc4.h
@@ -29,7 +29,7 @@
 #define MBEDTLS_ARC4_H
 
 #if !defined(MBEDTLS_CONFIG_FILE)
-#include "config.h"
+#include "mbedtls/config.h"
 #else
 #include MBEDTLS_CONFIG_FILE
 #endif