diff --git a/shell/platform/android/io/flutter/view/AccessibilityBridge.java b/shell/platform/android/io/flutter/view/AccessibilityBridge.java
index a969b1bb6b4..ebf19111b6c 100644
--- a/shell/platform/android/io/flutter/view/AccessibilityBridge.java
+++ b/shell/platform/android/io/flutter/view/AccessibilityBridge.java
@@ -691,8 +691,6 @@ class AccessibilityBridge extends AccessibilityNodeProvider implements BasicMess
                 e.getText().add((String) data.get("message"));
                 sendAccessibilityEvent(e);
             }
-            default:
-                assert false;
         }
     }
 
diff --git a/shell/platform/darwin/ios/framework/Source/accessibility_bridge.mm b/shell/platform/darwin/ios/framework/Source/accessibility_bridge.mm
index 4a6d70655ed..dcfbf7dcfeb 100644
--- a/shell/platform/darwin/ios/framework/Source/accessibility_bridge.mm
+++ b/shell/platform/darwin/ios/framework/Source/accessibility_bridge.mm
@@ -614,8 +614,6 @@ void AccessibilityBridge::HandleEvent(NSDictionary<NSString*, id>* annotatedEven
   if ([type isEqualToString:@"announce"]) {
     NSString* message = annotatedEvent[@"data"][@"message"];
     UIAccessibilityPostNotification(UIAccessibilityAnnouncementNotification, message);
-  } else {
-    NSCAssert(NO, @"Invalid event type %@", type);
   }
 }