diff --git a/library/x509.c b/library/x509.c
index 9fc6389..e0d54b6 100644
--- a/library/x509.c
+++ b/library/x509.c
@@ -21,7 +21,7 @@
 
 #include "mbedtls/asn1.h"
 #include "mbedtls/error.h"
-#include "mbedtls/oid.h"
+#include "x509_oid.h"
 
 #include <stdio.h>
 #include <string.h>