diff --git a/ext/json/tests/json_validate_invalid_flag.phpt b/ext/json/tests/json_validate_invalid_flag.phpt
new file mode 100644
index 0000000000000..c7d5e65604b01
--- /dev/null
+++ b/ext/json/tests/json_validate_invalid_flag.phpt
@@ -0,0 +1,17 @@
+--TEST--
+json_validate() throws with invalid flags
+--EXTENSIONS--
+json
+--FILE--
+<?php
+
+try {
+	json_validate("{}", 512, 9999999);
+	echo "no exception\n";	
+} catch (ValueError $e) {
+	echo "caught\n";
+}
+
+?>
+--EXPECT--
+caught
\ No newline at end of file