diff --git a/drivers/acpi/acpica/acmacros.h b/drivers/acpi/acpica/acmacros.h
index 19d40c6c1f326c73fef7906c8478a5f4f6a18c26..e85366ceb15a28d2a6c7602ce458253055c0c6fb 100644
--- a/drivers/acpi/acpica/acmacros.h
+++ b/drivers/acpi/acpica/acmacros.h
@@ -224,6 +224,11 @@
 
 #define ACPI_IS_ASCII(c)                ((c) < 0x80)
 
+/* Signed integers */
+
+#define ACPI_SIGN_POSITIVE              0
+#define ACPI_SIGN_NEGATIVE              1
+
 /*
  * Rounding macros (Power of two boundaries only)
  */