diff --git a/meta-oniro-core/recipes-devtools/flex/flex_%.bbappend b/meta-oniro-core/recipes-devtools/flex/flex_%.bbappend
index 6896e0d71c13028923a90dfe977d7debdce09ffc..ec651246a44375a3e567b3e87f93808a147200e3 100644
--- a/meta-oniro-core/recipes-devtools/flex/flex_%.bbappend
+++ b/meta-oniro-core/recipes-devtools/flex/flex_%.bbappend
@@ -8,4 +8,4 @@
 # -Werror=format-nonliteral globally in OPTIMIZE_FOR=security mode
 # while keeping flex building.
 
-TARGET_CFLAGS_remove = "-Werror=format-nonliteral"
+TARGET_CFLAGS:remove = "-Werror=format-nonliteral"