diff --git a/library/x509write_csr.c b/library/x509write_csr.c
index 7c51798..7dd3d45 100644
--- a/library/x509write_csr.c
+++ b/library/x509write_csr.c
@@ -24,11 +24,7 @@
  * - attributes: PKCS#9 v2.0 aka RFC 2985
  */
 
-#if !defined(MBEDTLS_CONFIG_FILE)
-#include "mbedtls/config.h"
-#else
-#include MBEDTLS_CONFIG_FILE
-#endif
+#include "common.h"
 
 #if defined(MBEDTLS_X509_CSR_WRITE_C)