diff --git a/datasophon-service/src/main/java/com/datasophon/api/load/GlobalVariables.java b/datasophon-service/src/main/java/com/datasophon/api/load/GlobalVariables.java
index d9083459..71d6cb2a 100644
--- a/datasophon-service/src/main/java/com/datasophon/api/load/GlobalVariables.java
+++ b/datasophon-service/src/main/java/com/datasophon/api/load/GlobalVariables.java
@@ -16,7 +16,7 @@ public static Map<String, String> get(Integer key) {
         return map.get(key);
     }
     
-    public static boolean exists(String key) {
+    public static boolean exists(Integer key) {
         return map.containsKey(key);
     }
 }