diff --git a/src/cmd/go/internal/test/test.go b/src/cmd/go/internal/test/test.go
index 5a56009829..0051970cfc 100644
--- a/src/cmd/go/internal/test/test.go
+++ b/src/cmd/go/internal/test/test.go
@@ -1306,6 +1306,7 @@ func (r *runTestActor) Act(b *work.Builder, ctx context.Context, a *work.Action)
 		cmd.Env = env
 	}
 
+	base.StartSigHandlers()
 	t0 := time.Now()
 	err = cmd.Start()
 
@@ -1314,7 +1315,6 @@ func (r *runTestActor) Act(b *work.Builder, ctx context.Context, a *work.Action)
 	// running.
 	if err == nil {
 		tick := time.NewTimer(testKillTimeout)
-		base.StartSigHandlers()
 		done := make(chan error)
 		go func() {
 			done <- cmd.Wait()
diff --git a/src/cmd/go/testdata/script/test2json_interrupt.txt b/src/cmd/go/testdata/script/test2json_interrupt.txt
index 5828e86136..763c336991 100644
--- a/src/cmd/go/testdata/script/test2json_interrupt.txt
+++ b/src/cmd/go/testdata/script/test2json_interrupt.txt
@@ -7,8 +7,8 @@ stdout -count=1 '"Action":"pass","Package":"example","Test":"FuzzInterrupt"'
 stdout -count=1 '"Action":"pass","Package":"example","Elapsed":'
 
 mkdir $WORK/fuzzcache
-go test -c . -fuzz=. -o test2json_interrupt_obj
-? go tool test2json -p example -t ./test2json_interrupt_obj -test.v -test.paniconexit0 -test.fuzzcachedir $WORK/fuzzcache -test.fuzz FuzzInterrupt -test.run '^$' -test.parallel 1
+go test -c . -fuzz=. -o example_test.exe
+? go tool test2json -p example -t ./example_test.exe -test.v -test.paniconexit0 -test.fuzzcachedir $WORK/fuzzcache -test.fuzz FuzzInterrupt -test.run '^$' -test.parallel 1
 stdout -count=1 '"Action":"pass","Package":"example","Test":"FuzzInterrupt"'
 stdout -count=1 '"Action":"pass","Package":"example","Elapsed":'
 
@@ -37,19 +37,22 @@ func FuzzInterrupt(f *testing.F) {
 		os.Setenv("GO_TEST_INTERRUPT_PIDS", fmt.Sprintf("%d,%d", ppid, pid))
 	}
 
+	sentInterrupt := false
 	f.Fuzz(func(t *testing.T, orig string) {
-		// Simulate a ctrl-C on the keyboard by sending SIGINT
-		// to the main test process and its parent.
-		for _, pid := range strings.Split(pids, ",") {
-			i, err := strconv.Atoi(pid)
-			if err != nil {
-				t.Fatal(err)
-			}
-			if p, err := os.FindProcess(i); err == nil {
-				p.Signal(os.Interrupt)
-				time.Sleep(10 * time.Millisecond)
-				pids = ""  // Only interrupt once.
+		if !sentInterrupt {
+			// Simulate a ctrl-C on the keyboard by sending SIGINT
+			// to the main test process and its parent.
+			for _, pid := range strings.Split(pids, ",") {
+				i, err := strconv.Atoi(pid)
+				if err != nil {
+					t.Fatal(err)
+				}
+				if p, err := os.FindProcess(i); err == nil {
+					p.Signal(os.Interrupt)
+					sentInterrupt = true // Only send interrupts once.
+				}
 			}
 		}
+		time.Sleep(1 * time.Millisecond)  // Delay the fuzzer a bit to avoid wasting CPU.
 	})
 }