diff --git a/config.json b/config.json
index 7ce5d2d..cf2668e 100644
--- a/config.json
+++ b/config.json
@@ -1,9 +1,9 @@
 {
   "aggregation_labels": {
-    0: "NONE",
-    1: "SUM",
-    2: "AVERAGE",
-    3: "COUNT"
+    "0": "NONE",
+    "1": "SUM",
+    "2": "AVERAGE",
+    "3": "COUNT"
   },
   "aggregation_loss_weight": 1.0,
   "aggregation_temperature": 1.0,