diff --git a/library/x509_crt.c b/library/x509_crt.c
index 6b5ac08042..c9a7c5c3c9 100644
--- a/library/x509_crt.c
+++ b/library/x509_crt.c
@@ -3500,6 +3500,8 @@ void mbedtls_x509_crt_free( mbedtls_x509_crt *crt )
 {
     mbedtls_x509_crt *cert_cur = crt;
     mbedtls_x509_crt *cert_prv;
+    mbedtls_x509_sequence *seq_cur;
+    mbedtls_x509_sequence *seq_prv;
 
     while( cert_cur != NULL )
     {