diff --git a/include/acpi/actbl3.h b/include/acpi/actbl3.h
index a067d7d0df7de5752673c97281f844ec3f832eab..c4aae227d25391b9b8715ec36d40b300abb61e96 100644
--- a/include/acpi/actbl3.h
+++ b/include/acpi/actbl3.h
@@ -75,7 +75,6 @@
 
 /* Reserved table signatures */
 
-#define ACPI_SIG_CSRT           "CSRT"	/* Core System Resources Table */
 #define ACPI_SIG_MATR           "MATR"	/* Memory Address Translation Table */
 #define ACPI_SIG_MSDM           "MSDM"	/* Microsoft Data Management Table */
 #define ACPI_SIG_WPBT           "WPBT"	/* Windows Platform Binary Table */