diff --git a/background.js b/background.js
index 445d9ae..ca72c11 100644
--- a/background.js
+++ b/background.js
@@ -37,6 +37,10 @@ chrome.pageAction.onClicked.addListener(function(tab) {
 			var filename = betterUrl.substr(betterUrl.lastIndexOf("/"));
 			filename = cleanExtension(filename);
 
+			if(filename.indexOf('.') == -1) {
+				filename = filename + '.jpg'; //on average, it's probably JPEG if it doesn't have an extension
+			}
+
 			chrome.storage.sync.get({url: '', tabbehaviour: '', copytoclipboard: false, replacebookmark: false, disableblacklist: false}, function(config) {
 				if(config.url == '') {
 					alert("Please select a Pomf clone.");