diff --git a/src/showdown.js b/src/showdown.js
index 3e37dab..28d715e 100644
--- a/src/showdown.js
+++ b/src/showdown.js
@@ -483,7 +483,7 @@ var _DoAnchors = function(text) {
 		)
 		/g,writeAnchorTag);
 	*/
-	text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\]\([ \t]*()<?(.*?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g,writeAnchorTag);
+	text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\]\([ \t]*()<?(.*?(?:\(.*?\).*?)?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g,writeAnchorTag);
 
 	//
 	// Last, handle reference-style shortcuts: [link text]
diff --git a/test/cases/url-with-parenthesis.html b/test/cases/url-with-parenthesis.html
new file mode 100644
index 0000000..d42cee8
--- /dev/null
+++ b/test/cases/url-with-parenthesis.html
@@ -0,0 +1,2 @@
+
+<p>There's an <a href="http://en.memory-alpha.org/wiki/Darmok_(episode)">episode</a> of Star Trek: The Next Generation</p>
\ No newline at end of file
diff --git a/test/cases/url-with-parenthesis.md b/test/cases/url-with-parenthesis.md
new file mode 100644
index 0000000..f271d26
--- /dev/null
+++ b/test/cases/url-with-parenthesis.md
@@ -0,0 +1,2 @@
+
+There's an [episode](http://en.memory-alpha.org/wiki/Darmok_(episode)) of Star Trek: The Next Generation
\ No newline at end of file