diff --git a/include/mbedtls/des.h b/include/mbedtls/des.h
index 54e6b78..1c80b53 100644
--- a/include/mbedtls/des.h
+++ b/include/mbedtls/des.h
@@ -30,7 +30,7 @@
 #define MBEDTLS_DES_H
 
 #if !defined(MBEDTLS_CONFIG_FILE)
-#include "config.h"
+#include "mbedtls/config.h"
 #else
 #include MBEDTLS_CONFIG_FILE
 #endif