diff --git a/src/cmd/dist/test.go b/src/cmd/dist/test.go
index f2c4cf0b430..4acd357974c 100644
--- a/src/cmd/dist/test.go
+++ b/src/cmd/dist/test.go
@@ -737,9 +737,9 @@ func (t *tester) registerTests() {
 						fn: func(dt *distTest) error {
 							cmd := t.addCmd(dt, "misc/swig/callback", t.goTest())
 							cmd.Env = append(os.Environ(),
-								"CGO_CFLAGS=-flto -Wno-lto-type-mismatch",
-								"CGO_CXXFLAGS=-flto -Wno-lto-type-mismatch",
-								"CGO_LDFLAGS=-flto -Wno-lto-type-mismatch",
+								"CGO_CFLAGS=-flto -Wno-lto-type-mismatch -Wno-unknown-warning-option",
+								"CGO_CXXFLAGS=-flto -Wno-lto-type-mismatch -Wno-unknown-warning-option",
+								"CGO_LDFLAGS=-flto -Wno-lto-type-mismatch -Wno-unknown-warning-option",
 							)
 							return nil
 						},