diff --git a/include/spdk/idxd_spec.h b/include/spdk/idxd_spec.h
index 9f9c864b3..f2cb235b1 100644
--- a/include/spdk/idxd_spec.h
+++ b/include/spdk/idxd_spec.h
@@ -54,15 +54,8 @@ extern "C" {
 #define PORTAL_MASK			(PORTAL_SIZE - 1)
 #define WQCFG_SHIFT			5
 
-#define CFG_ENGINE_OFFSET		0x20
-#define CFG_FLAG_OFFSET			0x28
-
-#define IDXD_CMD_SHIFT			20
-
 #define IDXD_TABLE_OFFSET_MULT		0x100
 
-#define IDXD_OPCAP_WORDS		0x4
-
 #define IDXD_CLEAR_CRC_FLAGS		0xFFFFu
 
 #define IDXD_FLAG_FENCE                 (1 << 0)