diff --git a/assets/json/math-game.json b/assets/json/math-game.json
index 839d8ea3..d2c80704 100644
--- a/assets/json/math-game.json
+++ b/assets/json/math-game.json
@@ -20,7 +20,7 @@
 			"*",
 			"/"
 		]
-	],
+	},
 	"difficulties": [
 		"easy",
 		"medium",