diff --git a/internal/mdplain/renderer.go b/internal/mdplain/renderer.go
index 55965dc..93bd5ec 100644
--- a/internal/mdplain/renderer.go
+++ b/internal/mdplain/renderer.go
@@ -61,9 +61,12 @@ func (r *TextRender) Render(w io.Writer, source []byte, n ast.Node) error {
 				return ast.WalkSkipChildren, nil
 			}
 			return ast.WalkContinue, nil
-		case *ast.AutoLink, *extAST.Strikethrough:
+		case *extAST.Strikethrough:
 			out.Write(node.Text(source))
 			return ast.WalkContinue, nil
+		case *ast.AutoLink:
+			out.Write(node.URL(source))
+			return ast.WalkSkipChildren, nil
 		case *ast.CodeSpan:
 			out.Write(node.Text(source))
 			return ast.WalkSkipChildren, nil
diff --git a/internal/mdplain/testdata/markdown.md b/internal/mdplain/testdata/markdown.md
index f5c1ecc..952e82e 100644
--- a/internal/mdplain/testdata/markdown.md
+++ b/internal/mdplain/testdata/markdown.md
@@ -50,6 +50,7 @@ These are the elements outlined in John Gruber’s original design document. All
 
 [Relative Link](#Code)
 
+Plain URL: https://www.markdownguide.org
 
 ### Image
 
diff --git a/internal/mdplain/testdata/mdplain.txt b/internal/mdplain/testdata/mdplain.txt
index c158f0c..d7dcbee 100644
--- a/internal/mdplain/testdata/mdplain.txt
+++ b/internal/mdplain/testdata/mdplain.txt
@@ -23,6 +23,7 @@ Horizontal Rule
 Link
 Markdown Guide https://www.markdownguide.org
 Relative Link
+Plain URL: https://www.markdownguide.org
 Image
 
 Extended Syntax