CB-4696 Fix compile error for Xcode 4.5.
diff --git a/src/ios/CDVNotification.m b/src/ios/CDVNotification.m
index d49abbd..58c04f0 100644
--- a/src/ios/CDVNotification.m
+++ b/src/ios/CDVNotification.m
@@ -24,6 +24,8 @@
 #define DIALOG_TYPE_ALERT @"alert"
 #define DIALOG_TYPE_PROMPT @"prompt"
 
+static void soundCompletionCallback(SystemSoundID ssid, void* data);
+
 @implementation CDVNotification
 
 /*