diff --git a/help_test.go b/help_test.go
index 77ac8cb..f93084b 100644
--- a/help_test.go
+++ b/help_test.go
@@ -810,38 +810,3 @@ test: error: missing flags: --flag=STRING
 `
 	assert.Equal(t, expected, w.String())
 }
-
-func TestCustomWrap(t *testing.T) {
-	var cli struct {
-		Flag string `help:"A string flag with very long help that wraps a lot and is verbose and is really verbose."`
-	}
-
-	w := bytes.NewBuffer(nil)
-	app := mustNew(t, &cli,
-		kong.Name("test-app"),
-		kong.Description("A test app."),
-		kong.HelpOptions{
-			WrapUpperBound: 50,
-		},
-		kong.Writers(w, w),
-		kong.Exit(func(int) {}),
-	)
-
-	_, err := app.Parse([]string{"--help"})
-	assert.NoError(t, err)
-	expected := `Usage: test-app
-
-A test app.
-
-Flags:
-  -h, --help           Show context-sensitive
-                       help.
-      --flag=STRING    A string flag with very
-                       long help that wraps a lot
-                       and is verbose and is
-                       really verbose.
-`
-	t.Log(w.String())
-	t.Log(expected)
-	assert.Equal(t, expected, w.String())
-}
diff --git a/helpwrap1.18_test.go b/helpwrap1.18_test.go
new file mode 100644
index 0000000..b72d55c
--- /dev/null
+++ b/helpwrap1.18_test.go
@@ -0,0 +1,47 @@
+//go:build !go1.19
+// +build !go1.19
+
+package kong_test
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/alecthomas/assert/v2"
+	"github.com/alecthomas/kong"
+)
+
+func TestCustomWrap(t *testing.T) {
+	var cli struct {
+		Flag string `help:"A string flag with very long help that wraps a lot and is verbose and is really verbose."`
+	}
+
+	w := bytes.NewBuffer(nil)
+	app := mustNew(t, &cli,
+		kong.Name("test-app"),
+		kong.Description("A test app."),
+		kong.HelpOptions{
+			WrapUpperBound: 50,
+		},
+		kong.Writers(w, w),
+		kong.Exit(func(int) {}),
+	)
+
+	_, err := app.Parse([]string{"--help"})
+	assert.NoError(t, err)
+	expected := `Usage: test-app
+
+A test app.
+
+Flags:
+  -h, --help           Show context-sensitive
+                       help.
+      --flag=STRING    A string flag with very
+                       long help that wraps a lot
+                       and is verbose and is
+                       really verbose.
+`
+	t.Log(w.String())
+	t.Log(expected)
+	assert.Equal(t, expected, w.String())
+}
diff --git a/helpwrap1.19_test.go b/helpwrap1.19_test.go
new file mode 100644
index 0000000..7b52f93
--- /dev/null
+++ b/helpwrap1.19_test.go
@@ -0,0 +1,50 @@
+// Wrapping of text changed in Go1.19 per https://github.com/alecthomas/kong/issues/325
+// The test has been split pre-go1.19 and go1.19 and onwards.
+
+//go:build go1.19
+// +build go1.19
+
+package kong_test
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/alecthomas/assert/v2"
+	"github.com/alecthomas/kong"
+)
+
+func TestCustomWrap(t *testing.T) {
+	var cli struct {
+		Flag string `help:"A string flag with very long help that wraps a lot and is verbose and is really verbose."`
+	}
+
+	w := bytes.NewBuffer(nil)
+	app := mustNew(t, &cli,
+		kong.Name("test-app"),
+		kong.Description("A test app."),
+		kong.HelpOptions{
+			WrapUpperBound: 50,
+		},
+		kong.Writers(w, w),
+		kong.Exit(func(int) {}),
+	)
+
+	_, err := app.Parse([]string{"--help"})
+	assert.NoError(t, err)
+	expected := `Usage: test-app
+
+A test app.
+
+Flags:
+  -h, --help           Show context-sensitive
+                       help.
+      --flag=STRING    A string flag with very
+                       long help that wraps a
+                       lot and is verbose and is
+                       really verbose.
+`
+	t.Log(w.String())
+	t.Log(expected)
+	assert.Equal(t, expected, w.String())
+}