diff --git a/src/core/PaperScript.js b/src/core/PaperScript.js
index 2e362cf9..bf8ba5a0 100644
--- a/src/core/PaperScript.js
+++ b/src/core/PaperScript.js
@@ -15,6 +15,8 @@
  * @namespace
  */
 
+// Locally override define, so acorn.js does not export itself
+var define = null;
 /*#*/ if (options.parser == 'acorn') {
 /*#*/ include('../../lib/acorn-min.js');
 /*#*/ } else if (options.parser == 'esprima') {
diff --git a/src/paper.js b/src/paper.js
index abceb5a1..c8ce54a4 100644
--- a/src/paper.js
+++ b/src/paper.js
@@ -130,3 +130,7 @@ var paper = new function() {
 /*#*/ include('export.js');
 return paper;
 };
+
+// Support AMD (e.g. require.js)
+if (define && define.amd)
+	define(paper);