diff --git a/CHANGELOG.md b/CHANGELOG.md
index 593d82e..48fb5e8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -23,6 +23,8 @@
 
 ### Deprecated
 
+- utils: Deprecate `is_time_legal()`
+
 ### Removed
 
 - requester: Remove related deprecated APIs
diff --git a/src/utils.c b/src/utils.c
index 71ae500..b884cca 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -232,7 +232,7 @@
 	}
 }
 
-LIBPLDM_ABI_STABLE
+LIBPLDM_ABI_DEPRECATED
 bool is_time_legal(uint8_t seconds, uint8_t minutes, uint8_t hours, uint8_t day,
 		   uint8_t month, uint16_t year)
 {