diff --git a/src/cmd/compile/internal/types2/stdlib_test.go b/src/cmd/compile/internal/types2/stdlib_test.go
index 108c0629c6..45c692d511 100644
--- a/src/cmd/compile/internal/types2/stdlib_test.go
+++ b/src/cmd/compile/internal/types2/stdlib_test.go
@@ -317,6 +317,7 @@ func TestStdFixed(t *testing.T) {
 		"issue16369.go",  // types2 handles this correctly - not an issue
 		"issue18459.go",  // types2 doesn't check validity of //go:xxx directives
 		"issue18882.go",  // types2 doesn't check validity of //go:xxx directives
+		"issue20027.go",  // types2 does not have constraints on channel element size
 		"issue20529.go",  // types2 does not have constraints on stack size
 		"issue22200.go",  // types2 does not have constraints on stack size
 		"issue22200b.go", // types2 does not have constraints on stack size
diff --git a/src/go/types/stdlib_test.go b/src/go/types/stdlib_test.go
index 4dd33a863e..8913c7d2c9 100644
--- a/src/go/types/stdlib_test.go
+++ b/src/go/types/stdlib_test.go
@@ -318,6 +318,7 @@ func TestStdFixed(t *testing.T) {
 		"issue16369.go",  // go/types handles this correctly - not an issue
 		"issue18459.go",  // go/types doesn't check validity of //go:xxx directives
 		"issue18882.go",  // go/types doesn't check validity of //go:xxx directives
+		"issue20027.go",  // go/types does not have constraints on channel element size
 		"issue20529.go",  // go/types does not have constraints on stack size
 		"issue22200.go",  // go/types does not have constraints on stack size
 		"issue22200b.go", // go/types does not have constraints on stack size
diff --git a/test/fixedbugs/issue20027.go b/test/fixedbugs/issue20027.go
new file mode 100644
index 0000000000..e93b359aeb
--- /dev/null
+++ b/test/fixedbugs/issue20027.go
@@ -0,0 +1,13 @@
+// errorcheck
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+var _ chan [0x2FFFF]byte         // ERROR "channel element type too large"
+var _ = make(chan [0x2FFFF]byte) // ERROR "channel element type too large"
+
+var c1 chan [0x2FFFF]byte         // ERROR "channel element type too large"
+var c2 = make(chan [0x2FFFF]byte) // ERROR "channel element type too large"