diff --git a/src/cmd/devdraw/cocoa-screen.m b/src/cmd/devdraw/cocoa-screen.m
index e7296e44..16053eaa 100644
--- a/src/cmd/devdraw/cocoa-screen.m
+++ b/src/cmd/devdraw/cocoa-screen.m
@@ -927,6 +927,8 @@ getkeyboard(NSEvent *e)
 	case NSFlagsChanged:
 		if(in.mbuttons || in.kbuttons){
 			in.kbuttons = 0;
+			if(m & NSControlKeyMask)
+				in.kbuttons |= 1;
 			if(m & NSAlternateKeyMask)
 				in.kbuttons |= 2;
 			if(m & NSCommandKeyMask)