diff --git a/library/x509_crt.c b/library/x509_crt.c
index 1de1ee6..00f3107 100644
--- a/library/x509_crt.c
+++ b/library/x509_crt.c
@@ -17,12 +17,11 @@
  *  [SIRO] https://cabforum.org/wp-content/uploads/Chunghwatelecom201503cabforumV4.pdf
  */
 
-#include "common.h"
+#include "x509_internal.h"
 
 #if defined(MBEDTLS_X509_CRT_PARSE_C)
 
 #include "mbedtls/x509_crt.h"
-#include "x509_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/oid.h"
 #include "mbedtls/platform_util.h"