diff --git a/library/sha256.c b/library/sha256.c
index 087a8e3..d8ddda5 100644
--- a/library/sha256.c
+++ b/library/sha256.c
@@ -24,11 +24,7 @@
  *  http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
  */
 
-#if !defined(MBEDTLS_CONFIG_FILE)
-#include "mbedtls/config.h"
-#else
-#include MBEDTLS_CONFIG_FILE
-#endif
+#include "common.h"
 
 #if defined(MBEDTLS_SHA256_C)