diff --git a/include/mbedtls/chacha20.h b/include/mbedtls/chacha20.h
index 2ae5e6e..243ae63 100644
--- a/include/mbedtls/chacha20.h
+++ b/include/mbedtls/chacha20.h
@@ -34,7 +34,7 @@
 #define MBEDTLS_CHACHA20_H
 
 #if !defined(MBEDTLS_CONFIG_FILE)
-#include "config.h"
+#include "mbedtls/config.h"
 #else
 #include MBEDTLS_CONFIG_FILE
 #endif