diff --git a/configs/skylake_ult b/configs/skylake_ult
index 5e67484..94d1161 100644
--- a/configs/skylake_ult
+++ b/configs/skylake_ult
@@ -2,4 +2,4 @@
 CONFIG_GFX_GMA_CPU_VARIANT	= ULT
 CONFIG_GFX_GMA_INTERNAL_PORT	= DP
 CONFIG_GFX_GMA_ANALOG_I2C_PORT	= PCH_DAC
-CONFIG_GFX_GMA_DEFAULT_MMIO	= 16#e000_0000#
+CONFIG_GFX_GMA_DEFAULT_MMIO	= 16\#e000_0000\#