diff --git a/spec/support/utils.ts b/spec/support/utils.ts
index a616c0078..8c796a3d3 100644
--- a/spec/support/utils.ts
+++ b/spec/support/utils.ts
@@ -30,8 +30,11 @@
  * @param strings
  * @returns
  */
-export function trimIndentation(strings: TemplateStringsArray) {
-    const str = strings.toString();
+export function trimIndentation(strings: TemplateStringsArray, ...values: any[]) {
+    // Combine the strings with the values using interpolation
+    let str = strings.reduce((acc, curr, index) => {
+        return acc + curr + (values[index] !== undefined ? values[index] : '');
+    }, '');
 
     // Count the number of spaces on the first line.
     let numSpaces = 0;
diff --git a/src/services/export/md.spec.ts b/src/services/export/md.spec.ts
index 405cf9db7..49260cbfa 100644
--- a/src/services/export/md.spec.ts
+++ b/src/services/export/md.spec.ts
@@ -3,42 +3,34 @@ import markdownExportService from "./md.js";
 import { trimIndentation } from "../../../spec/support/utils.js";
 
 describe("Markdown export", () => {
-    it("trims language tag for code blocks", () => {
-        const html = trimIndentation`\
-            <p>A diff:</p>
-            <pre><code class="language-text-x-diff">Hello
-            -world
-            +worldy
-            </code></pre>`;
-        const expected = trimIndentation`\
-            A diff:
 
-            \`\`\`diff
-            Hello
-            -world
-            +worldy
+    it("exports correct language tag for known languages", () => {
+        const conversionTable = {
+            "language-text-x-nginx-conf": "nginx",
+            "language-x-diff": "diff",
+            "language-application-javascript-env-frontend": "javascript",
+            "language-application-javascript-env-backend": "javascript"
+        };
 
-            \`\`\``;
+        for (const [ a, b ] of Object.entries(conversionTable)) {
+            const html = trimIndentation`\
+                <p>A diff:</p>
+                <pre><code class="${a}">Hello
+                -world
+                +worldy
+                </code></pre>`;
+            const expected = trimIndentation`\
+                A diff:
 
-        expect(markdownExportService.toMarkdown(html)).toBe(expected);
-    });
+                \`\`\`${b}
+                Hello
+                -world
+                +worldy
 
-    it("rewrites frontend script JavaScript code block", () => {
-        const html = `<pre><code class="language-application-javascript-env-frontend">Hello</code></pre>`;
-        const expected = trimIndentation`\
-            \`\`\`javascript
-            Hello
-            \`\`\``;
-        expect(markdownExportService.toMarkdown(html)).toBe(expected);
-    });
+                \`\`\``;
 
-    it("rewrites backend script JavaScript code block", () => {
-        const html = `<pre><code class="language-application-javascript-env-backend">Hello</code></pre>`;
-        const expected = trimIndentation`\
-            \`\`\`javascript
-            Hello
-            \`\`\``;
-        expect(markdownExportService.toMarkdown(html)).toBe(expected);
+            expect(markdownExportService.toMarkdown(html)).toBe(expected);
+        }
     });
 
     it("removes auto tag for code blocks", () => {
diff --git a/src/services/export/md.ts b/src/services/export/md.ts
index 7512655b0..cb4891b89 100644
--- a/src/services/export/md.ts
+++ b/src/services/export/md.ts
@@ -48,6 +48,8 @@ function rewriteLanguageTag(source: string) {
         case "application-javascript-env-frontend":
         case "application-javascript-env-backend":
             return "javascript";
+        case "text-x-nginx-conf":
+            return "nginx";
         default:
             return source.split("-").at(-1);
     }