diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index 31f1be74dd16..f3999ae7a43f 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -485,7 +485,7 @@ typedef u8 acpi_owner_id;
 /*
  * Constants with special meanings
  */
-#define ACPI_ROOT_OBJECT                ACPI_ADD_PTR (acpi_handle, NULL, ACPI_MAX_PTR)
+#define ACPI_ROOT_OBJECT                ACPI_ADD_PTR (acpi_handle, (void *) 0, ACPI_MAX_PTR)
 #define ACPI_WAIT_FOREVER               0xFFFF	/* u16, as per ACPI spec */
 #define ACPI_DO_NOT_WAIT                0
 
@@ -536,9 +536,9 @@ typedef u64 acpi_integer;
 
 /* Pointer/Integer type conversions */
 
-#define ACPI_TO_POINTER(i)              ACPI_ADD_PTR (void, (void *) NULL,(acpi_size) i)
-#define ACPI_TO_INTEGER(p)              ACPI_PTR_DIFF (p, (void *) NULL)
-#define ACPI_OFFSET(d, f)               ACPI_PTR_DIFF (&(((d *) 0)->f), (void *) NULL)
+#define ACPI_TO_POINTER(i)              ACPI_ADD_PTR (void, (void *) 0, (acpi_size) (i))
+#define ACPI_TO_INTEGER(p)              ACPI_PTR_DIFF (p, (void *) 0)
+#define ACPI_OFFSET(d, f)               ACPI_PTR_DIFF (&(((d *) 0)->f), (void *) 0)
 #define ACPI_PHYSADDR_TO_PTR(i)         ACPI_TO_POINTER(i)
 #define ACPI_PTR_TO_PHYSADDR(i)         ACPI_TO_INTEGER(i)