diff --git a/ios/Classes/SwiftFlutterTtsPlugin.swift b/ios/Classes/SwiftFlutterTtsPlugin.swift
index 7b18a353..b67a8260 100644
--- a/ios/Classes/SwiftFlutterTtsPlugin.swift
+++ b/ios/Classes/SwiftFlutterTtsPlugin.swift
@@ -501,6 +501,11 @@ extension AVSpeechSynthesisVoiceGender {
             return "female"
         case .unspecified:
             return "unspecified"
+        @unknown default:
+            // AVSpeechSynthesisVoiceGender is an Objective-C enum, so a voice
+            // can report a case this build was not compiled against. Without
+            // this the switch traps and takes the whole app down.
+            return "unspecified"
         }
     }
 }
diff --git a/macos/Classes/FlutterTtsPlugin.swift b/macos/Classes/FlutterTtsPlugin.swift
index f30bca60..09cc9789 100644
--- a/macos/Classes/FlutterTtsPlugin.swift
+++ b/macos/Classes/FlutterTtsPlugin.swift
@@ -406,6 +406,11 @@ extension AVSpeechSynthesisVoiceGender {
             return "female"
         case .unspecified:
             return "unspecified"
+        @unknown default:
+            // AVSpeechSynthesisVoiceGender is an Objective-C enum, so a voice
+            // can report a case this build was not compiled against. Without
+            // this the switch traps and takes the whole app down.
+            return "unspecified"
         }
     }
 }