diff --git a/deps/hiredis/sds.c b/deps/hiredis/sds.c
index 32d103d30..95454e997 100644
--- a/deps/hiredis/sds.c
+++ b/deps/hiredis/sds.c
@@ -390,6 +390,7 @@ sds sdscatvprintf(sds s, const char *fmt, va_list ap) {
         buf[buflen-2] = '\0';
         va_copy(cpy,ap);
         vsnprintf(buf, buflen, fmt, cpy);
+        va_end(ap);
         if (buf[buflen-2] != '\0') {
             if (buf != staticbuf) zfree(buf);
             buflen *= 2;