diff --git a/apple/OSX/platform.m b/apple/OSX/platform.m
index a87cebc957..ea903dbea7 100644
--- a/apple/OSX/platform.m
+++ b/apple/OSX/platform.m
@@ -186,10 +186,18 @@ static char** waiting_argv;
 
    waiting_argc = 0;
    _wantReload = false;
+}
 
+- (void)applicationDidBecomeActive:(NSNotification *)notification
+{
    apple_start_iteration();
 }
 
+- (void)applicationWillResignActive:(NSNotification *)notification
+{
+   apple_stop_iteration();
+}
+
 - (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)theApplication
 {
    return YES;