diff --git a/src/superio/acpi/pnp.asl b/src/superio/acpi/pnp.asl
index 4d3adaa9ed..1f63e825da 100644
--- a/src/superio/acpi/pnp.asl
+++ b/src/superio/acpi/pnp.asl
@@ -87,7 +87,7 @@
 /* Disable power saving mode */
 #define PNP_GENERIC_PS0(PM_REG, PM_VAL, PM_LDN) \
 	ENTER_CONFIG_MODE (PM_LDN)\
-	  PM_REG = Not(PM_VAL) \
+	  PM_REG = ~PM_VAL \
 	EXIT_CONFIG_MODE ()
 
 /* Enable power saving mode */