diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index f5ca0e989bba4..1c3002e1db20c 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -123,7 +123,6 @@
 
 #ifndef ACPI_USE_SYSTEM_INTTYPES
 
-typedef unsigned char u8;
 typedef unsigned char u8;
 typedef unsigned short u16;
 typedef short s16;