diff --git a/src/cmd/go/internal/cache/tailscale.go b/src/cmd/go/internal/cache/tailscale.go
new file mode 100644
index 00000000000000..e4dc5460907eec
--- /dev/null
+++ b/src/cmd/go/internal/cache/tailscale.go
@@ -0,0 +1,21 @@
+// Copyright 2026 Tailscale Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package cache
+
+import "runtime/debug"
+
+func init() {
+	bi, ok := debug.ReadBuildInfo()
+	if !ok {
+		return
+	}
+	for _, s := range bi.Settings {
+		if s.Key == "tailscale.toolchain.rev" && s.Value != "" {
+			hashSalt = append(hashSalt, ' ')
+			hashSalt = append(hashSalt, s.Value...)
+			return
+		}
+	}
+}