diff --git a/src/testing/fstest/testfs.go b/src/testing/fstest/testfs.go
index 8fc8acaaf3b..736bbf0590e 100644
--- a/src/testing/fstest/testfs.go
+++ b/src/testing/fstest/testfs.go
@@ -303,7 +303,7 @@ func (t *fsTester) checkGlob(dir string, list []fs.DirEntry) {
 		for i, e := range elem {
 			var pattern []rune
 			for j, r := range e {
-				if r == '*' || r == '?' || r == '\\' || r == '[' {
+				if r == '*' || r == '?' || r == '\\' || r == '[' || r == '-' {
 					pattern = append(pattern, '\\', r)
 					continue
 				}
diff --git a/src/testing/fstest/testfs_test.go b/src/testing/fstest/testfs_test.go
index 5b8813c3431..aefb4b33617 100644
--- a/src/testing/fstest/testfs_test.go
+++ b/src/testing/fstest/testfs_test.go
@@ -29,3 +29,12 @@ func TestSymlink(t *testing.T) {
 		t.Fatal(err)
 	}
 }
+
+func TestDash(t *testing.T) {
+	m := MapFS{
+		"a-b/a": {Data: []byte("a-b/a")},
+	}
+	if err := TestFS(m, "a-b/a"); err != nil {
+		t.Error(err)
+	}
+}