diff --git a/library/hkdf.c b/library/hkdf.c
index 82df597..0e9da59 100644
--- a/library/hkdf.c
+++ b/library/hkdf.c
@@ -18,11 +18,7 @@
  *
  *  This file is part of mbed TLS (https://tls.mbed.org)
  */
-#if !defined(MBEDTLS_CONFIG_FILE)
-#include "mbedtls/config.h"
-#else
-#include MBEDTLS_CONFIG_FILE
-#endif
+#include "common.h"
 
 #if defined(MBEDTLS_HKDF_C)