diff --git a/src/mainboard/google/guybrush/variants/dewatt/overridetree.cb b/src/mainboard/google/guybrush/variants/dewatt/overridetree.cb
index 5366d68587..f34bac86a0 100644
--- a/src/mainboard/google/guybrush/variants/dewatt/overridetree.cb
+++ b/src/mainboard/google/guybrush/variants/dewatt/overridetree.cb
@@ -58,6 +58,10 @@ chip soc/amd/cezanne
 		},
 	}"
 
+        # general purpose PCIe clock output configuration
+        register "gpp_clk_config[1]" = "GPP_CLK_OFF"
+        register "gpp_clk_config[2]" = "GPP_CLK_OFF"
+
 	# I2C Config
 	#+-------------------+---------------------------+
 	#| Field             |  Value                    |