diff --git a/config/mml/subscriber/udm_sub_mml_config.yaml b/config/mml/subscriber/udm_sub_mml_config.yaml
index 720fcc2e..9d44cc82 100644
--- a/config/mml/subscriber/udm_sub_mml_config.yaml
+++ b/config/mml/subscriber/udm_sub_mml_config.yaml
@@ -23,7 +23,7 @@ udm:
             display: "IMSI"
             comment: ""
           - name: "ki"
-            type: "int"
+            type: "string"
             optional: "false"
             filter: ""
             display: "Ki"