diff --git a/src/tls13.c b/src/tls13.c
index 09fd013d..2e726380 100644
--- a/src/tls13.c
+++ b/src/tls13.c
@@ -5874,9 +5874,9 @@ int tls13_recv_certificate_request(TLS_CONNECT *conn)
 	int signed_certificate_timestamp = 0;
 
 	int common_sig_algs[4];
-	size_t common_sig_algs_cnt;
+	size_t common_sig_algs_cnt = 0;
 	int common_sig_algs_cert[4];
-	size_t common_sig_algs_cert_cnt;
+	size_t common_sig_algs_cert_cnt = 0;
 	const uint8_t *ca_names = NULL;
 	size_t ca_names_len = 0;
 	const uint8_t *filters = NULL;