diff --git a/chrome/content/zotero/xpcom/zotero.js b/chrome/content/zotero/xpcom/zotero.js
index f343c599f5..4c555ba76c 100644
--- a/chrome/content/zotero/xpcom/zotero.js
+++ b/chrome/content/zotero/xpcom/zotero.js
@@ -213,6 +213,7 @@ Services.scriptloader.loadSubScript("resource://zotero/polyfill.js");
 			var version = yield deferred.promise;
 		}
 		Zotero.version = version;
+		Zotero.isDevBuild = Zotero.version.includes('beta') || Zotero.version.includes('SOURCE');
 		
 		// OS platform
 		var win = Components.classes["@mozilla.org/appshell/appShellService;1"]