diff --git a/Grbl_Esp32/data/config.yaml b/Grbl_Esp32/data/config.yaml
index 6da31381..b2225c16 100644
--- a/Grbl_Esp32/data/config.yaml
+++ b/Grbl_Esp32/data/config.yaml
@@ -54,7 +54,7 @@ axes:
 
     gang0:
       endstops:
-        dual: gpio.16:low:pu
+        dual: gpio.16:PU:low
       stepstick:
         direction: gpio:33
         step: gpio.27