diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index 72a6e2c3a5361fa3a1b5b5e0ef2548ec97569863..56bf492e7acc819e7718e6cc13dd85b3b206560a 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -344,7 +344,7 @@ typedef u32 acpi_integer;
 
 /* 64-bit integers */
 
-typedef u64 acpi_integer;
+typedef unsigned long long              acpi_integer;
 #define ACPI_INTEGER_MAX                ACPI_UINT64_MAX
 #define ACPI_INTEGER_BIT_SIZE           64
 #define ACPI_MAX_DECIMAL_DIGITS         20	/* 2^64 = 18,446,744,073,709,551,616 */