diff --git a/library/des.c b/library/des.c
index 24e517e..e135219 100644
--- a/library/des.c
+++ b/library/des.c
@@ -25,11 +25,7 @@
  *  http://csrc.nist.gov/publications/fips/fips46-3/fips46-3.pdf
  */
 
-#if !defined(MBEDTLS_CONFIG_FILE)
-#include "mbedtls/config.h"
-#else
-#include MBEDTLS_CONFIG_FILE
-#endif
+#include "common.h"
 
 #if defined(MBEDTLS_DES_C)