diff --git a/include/polarssl/md_wrap.h b/include/polarssl/md_wrap.h
index d681a0c..634bb7d 100644
--- a/include/polarssl/md_wrap.h
+++ b/include/polarssl/md_wrap.h
@@ -29,7 +29,11 @@
 #ifndef POLARSSL_MD_WRAP_H
 #define POLARSSL_MD_WRAP_H
 
+#if !defined(POLARSSL_CONFIG_FILE)
 #include "config.h"
+#else
+#include POLARSSL_CONFIG_FILE
+#endif
 #include "md.h"
 
 #ifdef __cplusplus