diff --git a/tap_appsflyer/schemas/raw_data/installations.json b/tap_appsflyer/schemas/raw_data/installations.json
index 19641be..97f61d3 100644
--- a/tap_appsflyer/schemas/raw_data/installations.json
+++ b/tap_appsflyer/schemas/raw_data/installations.json
@@ -344,7 +344,8 @@
     "customer_user_id": {
       "type": [
         "null",
-        "integer"
+        "integer",
+        "string"
       ]
     },
     "imei": {