diff --git a/TFT/src/User/os_timer.c b/TFT/src/User/os_timer.c
index bf30daec40..031c6b1e17 100644
--- a/TFT/src/User/os_timer.c
+++ b/TFT/src/User/os_timer.c
@@ -52,7 +52,7 @@ void TIMER6_IRQHandler(void)
 
     checkTouchScreen();  // check touch screen once a millisecond
 
-    TIMER_INTF(TIMER6) &= TIMER_INTF_UPIF;  // clear interrupt flag
+    TIMER_INTF(TIMER6) &= ~TIMER_INTF_UPIF;  // clear interrupt flag
   }
 }
 #else