diff --git a/src/runtime/crash_test.go b/src/runtime/crash_test.go
index 7c7532b4e6a..8a48c351f6e 100644
--- a/src/runtime/crash_test.go
+++ b/src/runtime/crash_test.go
@@ -165,6 +165,11 @@ func checkStaleRuntime(t *testing.T) {
 		}
 		if string(out) != "false\n" {
 			t.Logf("go list -f {{.Stale}} runtime:\n%s", out)
+			out, err := testEnv(exec.Command(testenv.GoToolPath(t), "list", "-f", "{{.StaleReason}}", "runtime")).CombinedOutput()
+			if err != nil {
+				t.Logf("go list -f {{.StaleReason}} failed: %v", err)
+			}
+			t.Logf("go list -f {{.StaleReason}} runtime:\n%s", out)
 			staleRuntimeErr = fmt.Errorf("Stale runtime.a. Run 'go install runtime'.")
 		}
 	})