diff --git a/src/ios/APPBackgroundMode.m b/src/ios/APPBackgroundMode.m
index be941ee..4537fcc 100644
--- a/src/ios/APPBackgroundMode.m
+++ b/src/ios/APPBackgroundMode.m
@@ -221,8 +221,8 @@ NSString* const kAPPBackgroundEventDeactivate = @"deactivate";
 
     NSString* flag = [NSString stringWithFormat:@"%@._isActive=%@;",
                       kAPPBackgroundJsNamespace, active];
-
-    NSString* depFn = [NSString stringWithFormat:@"%@.on%@();",
+                       
+    NSString* depFn = [NSString stringWithFormat:@"%@.on('%@');",
                        kAPPBackgroundJsNamespace, event];
 
     NSString* fn = [NSString stringWithFormat:@"%@.fireEvent('%@');",