diff --git a/src/tools/wasm-reduce/wasm-reduce.cpp b/src/tools/wasm-reduce/wasm-reduce.cpp
index cf5855274d7..d69d698b601 100644
--- a/src/tools/wasm-reduce/wasm-reduce.cpp
+++ b/src/tools/wasm-reduce/wasm-reduce.cpp
@@ -279,7 +279,7 @@ struct Reducer
       "--dce",
       "--duplicate-function-elimination",
       "--enclose-world",
-      "--gto",
+      "--gto --closed-world",
       "--inlining",
       "--inlining-optimizing",
       "--optimize-level=3 --inlining-optimizing",
diff --git a/test/reduce/gc.wast b/test/reduce/gc.wast
index 98d1cd07545..52756d4fc7a 100644
--- a/test/reduce/gc.wast
+++ b/test/reduce/gc.wast
@@ -1,5 +1,6 @@
 (module
   (rec
+    ;; The funcref field can be optimized away with --gto.
     (type $A (struct (field (mut i32)) (field funcref)))
     ;; This type can be optimized away.
     (type $unused (struct))
diff --git a/test/reduce/gc.wast.txt b/test/reduce/gc.wast.txt
index 3af5287ce99..1fcf771c205 100644
--- a/test/reduce/gc.wast.txt
+++ b/test/reduce/gc.wast.txt
@@ -1,5 +1,5 @@
 (module
- (type $0 (struct (field (mut i32)) (field funcref)))
+ (type $0 (struct (field (mut i32))))
  (type $1 (func (result i32)))
  (global $global$0 (ref null $0) (struct.new_default $0))
  (export "use-global" (func $0))