diff --git a/src/os/os_test.go b/src/os/os_test.go
index 865dfcc0def..50160eac385 100644
--- a/src/os/os_test.go
+++ b/src/os/os_test.go
@@ -9,6 +9,7 @@ import (
 	"errors"
 	"flag"
 	"fmt"
+	"internal/race"
 	"internal/testenv"
 	"io"
 	"io/ioutil"
@@ -2579,3 +2580,20 @@ func TestOpenFileKeepsPermissions(t *testing.T) {
 		t.Errorf("Stat after OpenFile is %v, should be writable", fi.Mode())
 	}
 }
+
+// Issue 41474.
+func TestStdoutWriteDoesNotHeapAllocate(t *testing.T) {
+	if runtime.GOOS == "js" || runtime.GOOS == "windows" {
+		t.Skip("Still heap allocates on js/wasm and windows, but it used to too")
+	}
+	if race.Enabled {
+		t.Skip("Heap allocates in race mode")
+	}
+
+	n := testing.AllocsPerRun(10, func() {
+		Stdout.Write([]byte{'h', 'e', 'l', 'l', 'o', '\n'})
+	})
+	if n != 0 {
+		t.Errorf("AllocsPerRun = %v, want 0", n)
+	}
+}