diff --git a/src/runtime/debug/garbage_test.go b/src/runtime/debug/garbage_test.go
index acc781ebdc..2110f90824 100644
--- a/src/runtime/debug/garbage_test.go
+++ b/src/runtime/debug/garbage_test.go
@@ -135,7 +135,7 @@ func TestSetGCPercent(t *testing.T) {
 		t.Fatalf("failed to set up baseline live heap; got %d MB, want %d MB", ms.Alloc>>20, baseline>>20)
 	}
 	// NextGC should be ~200 MB.
-	const thresh = 10 << 20
+	const thresh = 20 << 20 // TODO: Figure out why this is so noisy on some builders
 	if want := int64(2 * baseline); abs64(want-int64(ms.NextGC)) > thresh {
 		t.Errorf("NextGC = %d MB, want %d±%d MB", ms.NextGC>>20, want>>20, thresh>>20)
 	}