diff --git a/dist/showdown.js b/dist/showdown.js
index 675c45f..5cacdeb 100644
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diff --git a/dist/showdown.js.map b/dist/showdown.js.map
index 4cd9ef3..2fb964f 100644
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diff --git a/dist/showdown.min.js b/dist/showdown.min.js
index 16c3cb5..e30d275 100644
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diff --git a/dist/showdown.min.js.map b/dist/showdown.min.js.map
index 5806330..a394f17 100644
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diff --git a/src/subParsers/makehtml/githubCodeBlocks.js b/src/subParsers/makehtml/githubCodeBlocks.js
index 660ba75..2976b49 100644
--- a/src/subParsers/makehtml/githubCodeBlocks.js
+++ b/src/subParsers/makehtml/githubCodeBlocks.js
@@ -20,7 +20,7 @@ showdown.subParser('makehtml.githubCodeBlocks', function (text, options, globals
 
   text += '¨0';
 
-  text = text.replace(/(?:^|\n)(```+|~~~+)([^\s`~]*)\n([\s\S]*?)\n\1/g, function (wholeMatch, delim, language, codeblock) {
+  text = text.replace(/(?:^|\n)(```+|~~~+)(?: *)([^\s`~]*)\n([\s\S]*?)\n\1/g, function (wholeMatch, delim, language, codeblock) {
     var end = (options.omitExtraWLInCodeBlocks) ? '' : '\n';
 
     // First parse the github code block
diff --git a/test/functional/makehtml/cases/standard/github-style-codeblock.html b/test/functional/makehtml/cases/standard/github-style-codeblock.html
index 57fdf4e..f1f5856 100644
--- a/test/functional/makehtml/cases/standard/github-style-codeblock.html
+++ b/test/functional/makehtml/cases/standard/github-style-codeblock.html
@@ -6,6 +6,11 @@
 <p>And some HTML</p>
 <pre><code class="html language-html">&lt;div&gt;HTML!&lt;/div&gt;
 </code></pre>
+<p>And some CSS with spaces before the language declaration</p>
+<pre><code class="css language-css">body {
+font-size: 1.5em;
+}
+</code></pre>
 <p>Use more than 3 backticks</p>
 <pre><code>some code
 </code></pre>
diff --git a/test/functional/makehtml/cases/standard/github-style-codeblock.md b/test/functional/makehtml/cases/standard/github-style-codeblock.md
index bae8447..d84cf6d 100644
--- a/test/functional/makehtml/cases/standard/github-style-codeblock.md
+++ b/test/functional/makehtml/cases/standard/github-style-codeblock.md
@@ -13,6 +13,14 @@ And some HTML
 <div>HTML!</div>
 ```
 
+And some CSS with spaces before the language declaration
+
+```    css
+body {
+    font-size: 1.5em;
+}
+```
+
 Use more than 3 backticks
 
 `````