diff --git a/src/cmd/go/go_test.go b/src/cmd/go/go_test.go
index 5e3c2704a6..fb69e5324c 100644
--- a/src/cmd/go/go_test.go
+++ b/src/cmd/go/go_test.go
@@ -5093,6 +5093,9 @@ func TestGoTestMinusN(t *testing.T) {
 }
 
 func TestGoTestJSON(t *testing.T) {
+	if runtime.NumCPU() == 1 {
+		t.Skip("skipping on uniprocessor")
+	}
 	tg := testgo(t)
 	defer tg.cleanup()
 	tg.parallel()