diff --git a/test/core/json/json_test.c b/test/core/json/json_test.c
index 13ee5bbe456..49bdf377acf 100644
--- a/test/core/json/json_test.c
+++ b/test/core/json/json_test.c
@@ -89,6 +89,7 @@ static testing_pair testing_pairs[] = {
     {"{\"foo\": bar}", NULL},
     {"{\"foo\": bar\"x\"}", NULL},
     {"fals", NULL},
+    {"0,0", NULL},
     /* Testing unterminated string. */
     {"\"\\x", NULL},
     /* Testing invalid UTF-16 number. */