diff --git a/src/sysinput.c b/src/sysinput.c
index 9419d5d..a616063 100644
--- a/src/sysinput.c
+++ b/src/sysinput.c
@@ -117,7 +117,7 @@ static BOOL poll_touchscreen(void)
 			touch_down_y = touch_y;
 			touch_down_time = now;
 		  }
-		  else if (touch_nextmsg = WM_TOUCHUP)
+		  else if (touch_nextmsg == WM_TOUCHUP)
 		  {
 		    if (   ((now - touch_down_time) <= Gconfig.click_time)
 		        && (ABS((INT32)touch_x - (INT32)touch_down_x) <= Gconfig.click_radius)