diff --git a/test/fixedbugs/issue42686.go b/test/fixedbugs/issue42686.go
index 962bdd35cbe..9f9075ca7d0 100644
--- a/test/fixedbugs/issue42686.go
+++ b/test/fixedbugs/issue42686.go
@@ -1,4 +1,4 @@
-// compile -d=fieldtrack
+// compile -goexperiment fieldtrack
 
 // Copyright 2020 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
diff --git a/test/run.go b/test/run.go
index 4c01886560e..7d5a558f2d2 100644
--- a/test/run.go
+++ b/test/run.go
@@ -513,7 +513,7 @@ func (t *test) run() {
 		return
 	}
 
-	var args, flags []string
+	var args, flags, runenv []string
 	var tim int
 	wantError := false
 	wantAuto := false
@@ -572,6 +572,9 @@ func (t *test) run() {
 			if err != nil {
 				t.err = fmt.Errorf("need number of seconds for -t timeout, got %s instead", args[0])
 			}
+		case "-goexperiment": // set GOEXPERIMENT environment
+			args = args[1:]
+			runenv = append(runenv, "GOEXPERIMENT="+args[0])
 
 		default:
 			flags = append(flags, args[0])
@@ -628,6 +631,7 @@ func (t *test) run() {
 		if tempDirIsGOPATH {
 			cmd.Env = append(cmd.Env, "GOPATH="+t.tempDir)
 		}
+		cmd.Env = append(cmd.Env, runenv...)
 
 		var err error