diff --git a/src/osx/cocoa/utils.mm b/src/osx/cocoa/utils.mm
index 39d2287aa2..eb43898763 100644
--- a/src/osx/cocoa/utils.mm
+++ b/src/osx/cocoa/utils.mm
@@ -173,7 +173,9 @@ void wxMacWakeUp()
 {
     resultCode = returnCode;
     sheetFinished = YES;
-    [sheet orderOut: self];
+    // NSAlerts don't need nor respond to orderOut
+    if ([sheet respondsToSelector:@selector(orderOut:)])
+        [sheet orderOut: self];
 }
 @end