diff --git a/library/sha1.c b/library/sha1.c
index 9233943..79bac6b 100644
--- a/library/sha1.c
+++ b/library/sha1.c
@@ -24,11 +24,7 @@
  *  http://www.itl.nist.gov/fipspubs/fip180-1.htm
  */
 
-#if !defined(MBEDTLS_CONFIG_FILE)
-#include "mbedtls/config.h"
-#else
-#include MBEDTLS_CONFIG_FILE
-#endif
+#include "common.h"
 
 #if defined(MBEDTLS_SHA1_C)