diff --git a/CHANGELOG.md b/CHANGELOG.md
index f1a9dd7..5f094c0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,10 @@
 
 ## [Unreleased]
 
+### Added
+
+1. base: Define macros for reserved TIDs
+
 ## [0.8.0] - 2024-05-23
 
 ### Added
diff --git a/include/libpldm/base.h b/include/libpldm/base.h
index 01a0418..562ef58 100644
--- a/include/libpldm/base.h
+++ b/include/libpldm/base.h
@@ -95,6 +95,8 @@
 #define PLDM_MAX_TYPES	       64
 #define PLDM_MAX_CMDS_PER_TYPE 256
 #define PLDM_MAX_TIDS	       256
+#define PLDM_TID_UNASSIGNED    0x00
+#define PLDM_TID_RESERVED      0xff
 
 /* Message payload lengths */
 #define PLDM_GET_COMMANDS_REQ_BYTES 5
diff --git a/include/libpldm/platform.h b/include/libpldm/platform.h
index db28468..ece3ab1 100644
--- a/include/libpldm/platform.h
+++ b/include/libpldm/platform.h
@@ -94,7 +94,6 @@
 	 PLDM_PDR_NUMERIC_EFFECTER_PDR_VARIED_RANGE_FIELD_MIN_LENGTH)
 
 #define PLDM_INVALID_EFFECTER_ID 0xffff
-#define PLDM_TID_RESERVED	 0xff
 
 /* DSP0248 Table1 PLDM monitoring and control data types */
 #define PLDM_STR_UTF_8_MAX_LEN	256