diff --git a/Mac/Unsupported/mactcp/mactcpmodule.c b/Mac/Unsupported/mactcp/mactcpmodule.c
index 81c1f0f0b71..e7dc31753c0 100644
--- a/Mac/Unsupported/mactcp/mactcpmodule.c
+++ b/Mac/Unsupported/mactcp/mactcpmodule.c
@@ -358,7 +358,7 @@ tcps_wait(self, args)
 	if (!newgetargs(args, ""))
 		return NULL;
 	while ( self->async_busy ) {
-		if ( !PyMac_Idle() ) {
+		if ( PyMac_Idle() ) {
 			INCREF(None);
 			return None;
 		}