diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index 683d5277359e..57db15f7947f 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -305,6 +305,7 @@ declare_features! (
     (removed, struct_inherit, "1.0.0", None),
     (removed, test_removed_feature, "1.0.0", None),
     (removed, visible_private_types, "1.0.0", None),
+    (removed, unsafe_no_drop_flag, "1.0.0", None),
 );
 
 declare_features! (