diff --git a/.github/workflows/build-asciidoc.yml b/.github/workflows/build-asciidoc.yml
index 1b0e8eb..899c5bf 100644
--- a/.github/workflows/build-asciidoc.yml
+++ b/.github/workflows/build-asciidoc.yml
@@ -48,8 +48,8 @@ jobs:
           mkdir ../target
           cp Practical-Gremlin.html ../target/index.html
         env:
-          search_string: <h1>PRACTICAL GREMLIN: An Apache TinkerPop Tutorial<\/h1>
-          replace_string: <img src="PRACTICAL-GREMLIN-Revised-v2.png">\n<h1>PRACTICAL GREMLIN:<br\/>An Apache TinkerPop Tutorial<\/h1>
+          search_string: "<h1>PRACTICAL GREMLIN: An Apache TinkerPop Tutorial<\/h1>"
+          replace_string: "<img src=\"PRACTICAL-GREMLIN-Revised-v2.png\">\n<h1>PRACTICAL GREMLIN:<br\/>An Apache TinkerPop Tutorial<\/h1>"
       - name: Setup Pages
         uses: actions/configure-pages@v3
       - name: Upload artifact