diff --git a/include/ruby/internal/fl_type.h b/include/ruby/internal/fl_type.h
index 455448fe8d..994003653d 100644
--- a/include/ruby/internal/fl_type.h
+++ b/include/ruby/internal/fl_type.h
@@ -109,8 +109,8 @@
 #define RB_OBJ_TAINTED       RB_OBJ_TAINTED
 #define RB_OBJ_TAINTED_RAW   RB_OBJ_TAINTED_RAW
 #define RB_OBJ_TAINT_RAW     RB_OBJ_TAINT_RAW
-#define RB_OBJ_UNTRUST       RB_OBJ_UNTRUST
-#define RB_OBJ_UNTRUSTED     RB_OBJ_UNTRUSTED
+#define RB_OBJ_UNTRUST       RB_OBJ_TAINT
+#define RB_OBJ_UNTRUSTED     RB_OBJ_TAINTED
 /** @endcond */
 
 /**