diff --git a/src/ios/AppDelegate+FirebasePlugin.m b/src/ios/AppDelegate+FirebasePlugin.m
index 58dd642db..924fc3efa 100644
--- a/src/ios/AppDelegate+FirebasePlugin.m
+++ b/src/ios/AppDelegate+FirebasePlugin.m
@@ -49,6 +49,11 @@ - (NSNumber *)applicationInBackground {
 - (BOOL)application:(UIApplication *)application swizzledDidFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
     [self application:application swizzledDidFinishLaunchingWithOptions:launchOptions];
     
+    #if DEBUG
+        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"/google/firebase/debug_mode"];
+        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"/google/measurement/debug_mode"];
+    #endif
+    
     @try{
         instance = self;