diff --git a/xc7/blinky.pcf b/xc7/blinky.pcf
index 6c2e5149..1b85ac5f 100644
--- a/xc7/blinky.pcf
+++ b/xc7/blinky.pcf
@@ -3,6 +3,7 @@ COMP "led1" LOCATE = SITE "M15" LEVEL 1;
 COMP "led2" LOCATE = SITE "G14" LEVEL 1;
 COMP "led3" LOCATE = SITE "D18" LEVEL 1;
 COMP "clki" LOCATE = SITE "K17" LEVEL 1;
+COMP "clk_gb" LOCATE = SITE "BUFGCTRL_X0Y31" LEVEL 1;
 NET "clki" PERIOD = 8 nS ;
 PIN "clki_pin" = BEL "clki.PAD" PINNAME PAD;
 PIN "clki_pin" CLOCK_DEDICATED_ROUTE = FALSE;