diff --git a/chrome/content/zotero/browser.js b/chrome/content/zotero/browser.js
index 0c301991d3..dae65b6ae8 100644
--- a/chrome/content/zotero/browser.js
+++ b/chrome/content/zotero/browser.js
@@ -874,13 +874,11 @@ Zotero_Browser.Tab.prototype.getCaptureState = function () {
  * current page, or false if the page cannot be scraped
  */
 Zotero_Browser.Tab.prototype.getCaptureIcon = function (hiDPI) {
-	var suffix = hiDPI ? "@2x" : "";
-	
 	switch (this.getCaptureState()) {
 	case this.CAPTURE_STATE_TRANSLATABLE:
 		var itemType = this.getPageObject().translators[0].itemType;
 		return (itemType === "multiple"
-				? "chrome://zotero/skin/treesource-collection" + suffix + ".png"
+				? "chrome://zotero/skin/treesource-collection" + Zotero.hiDPISuffix + ".png"
 				: Zotero.ItemTypes.getImageSrc(itemType));
 	
 	default:
@@ -890,8 +888,7 @@ Zotero_Browser.Tab.prototype.getCaptureIcon = function (hiDPI) {
 
 // TODO: Show icons for images, PDFs, etc.?
 Zotero_Browser.Tab.prototype.getWebPageCaptureIcon = function (hiDPI) {
-	var suffix = hiDPI ? "@2x" : "";
-	return "chrome://zotero/skin/treeitem-webpage" + suffix + ".png";
+	return "chrome://zotero/skin/treeitem-webpage" + Zotero.hiDPISuffix + ".png";
 }
 
 Zotero_Browser.Tab.prototype.getCaptureTooltip = function() {
diff --git a/chrome/content/zotero/overlay.js b/chrome/content/zotero/overlay.js
index 6eef83581f..166e866d6e 100644
--- a/chrome/content/zotero/overlay.js
+++ b/chrome/content/zotero/overlay.js
@@ -87,8 +87,9 @@ var ZoteroOverlay = new function()
 			
 			observerService.addObserver(zoteroObserver, "browser-delayed-startup-finished", false);
 			
-			// Set a flag for hi-res displays
+			// Set flags for hi-res displays
 			Zotero.hiDPI = window.devicePixelRatio > 1;
+			Zotero.hiDPISuffix = Zotero.hiDPI ? "@2x" : "";
 			
 			// Clear old Zotero icon pref
 			var prefBranch = Components.classes["@mozilla.org/preferences-service;1"]
diff --git a/chrome/content/zotero/xpcom/collectionTreeView.js b/chrome/content/zotero/xpcom/collectionTreeView.js
index c9418cf1fc..41d5a345a4 100644
--- a/chrome/content/zotero/xpcom/collectionTreeView.js
+++ b/chrome/content/zotero/xpcom/collectionTreeView.js
@@ -711,7 +711,7 @@ Zotero.CollectionTreeView.prototype.getCellText = function(row, column)
 
 Zotero.CollectionTreeView.prototype.getImageSrc = function(row, col)
 {
-	var suffix = Zotero.hiDPI ? "@2x" : "";
+	var suffix = Zotero.hiDPISuffix;
 	
 	var treeRow = this.getRow(row);
 	var collectionType = treeRow.type;
diff --git a/chrome/content/zotero/xpcom/data/cachedTypes.js b/chrome/content/zotero/xpcom/data/cachedTypes.js
index c81e0b0e78..b9691c29c0 100644
--- a/chrome/content/zotero/xpcom/data/cachedTypes.js
+++ b/chrome/content/zotero/xpcom/data/cachedTypes.js
@@ -441,7 +441,7 @@ Zotero.ItemTypes = new function() {
 	}
 	
 	this.getImageSrc = function (itemType) {
-		var suffix = Zotero.hiDPI ? "@2x" : "";
+		var suffix = Zotero.hiDPISuffix;
 		
 		if (this.isCustom(itemType)) {
 			var id = this.getID(itemType) - this.customIDOffset;
diff --git a/chrome/content/zotero/xpcom/data/collection.js b/chrome/content/zotero/xpcom/data/collection.js
index e53cce0eff..c33cf6191d 100644
--- a/chrome/content/zotero/xpcom/data/collection.js
+++ b/chrome/content/zotero/xpcom/data/collection.js
@@ -91,8 +91,7 @@ Zotero.defineProperty(Zotero.Collection.prototype, 'collectionTreeViewID', {
 
 Zotero.defineProperty(Zotero.Collection.prototype, 'collectionTreeViewImage', {
 	get: function () {
-		var suffix = Zotero.hiDPI ? "@2x" : "";
-		return "chrome://zotero/skin/treesource-collection" + suffix + ".png";
+		return "chrome://zotero/skin/treesource-collection" + Zotero.hiDPISuffix + ".png";
 	}
 });
 
diff --git a/chrome/content/zotero/xpcom/data/library.js b/chrome/content/zotero/xpcom/data/library.js
index 24773f0b58..1f2cf7f3b9 100644
--- a/chrome/content/zotero/xpcom/data/library.js
+++ b/chrome/content/zotero/xpcom/data/library.js
@@ -182,8 +182,7 @@ Zotero.defineProperty(Zotero.Library.prototype, 'collectionTreeViewID', {
 
 Zotero.defineProperty(Zotero.Library.prototype, 'collectionTreeViewImage', {
 	get: function () {
-		var suffix = Zotero.hiDPI ? "@2x" : "";
-		return "chrome://zotero/skin/treesource-library" + suffix + ".png";
+		return "chrome://zotero/skin/treesource-library" + Zotero.hiDPISuffix + ".png";
 	}
 });