diff --git a/CHANGELOG.md b/CHANGELOG.md
index 48fb5e8..259f96c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,7 @@
 ### Deprecated
 
 - utils: Deprecate `is_time_legal()`
+- utils: Deprecate `is_transfer_flag_valid()`
 
 ### Removed
 
diff --git a/src/utils.c b/src/utils.c
index b884cca..5e92cbf 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -251,7 +251,7 @@
 	return true;
 }
 
-LIBPLDM_ABI_STABLE
+LIBPLDM_ABI_DEPRECATED
 bool is_transfer_flag_valid(uint8_t transfer_flag)
 {
 	switch (transfer_flag) {