diff --git a/chrome/content/zotero/preferences/librariesToSync.xul b/chrome/content/zotero/preferences/librariesToSync.xul
index e11d842c2d..20da833ccf 100644
--- a/chrome/content/zotero/preferences/librariesToSync.xul
+++ b/chrome/content/zotero/preferences/librariesToSync.xul
@@ -52,7 +52,7 @@
 			onclick="Zotero_Preferences.Sync.clickLibraryToSync(event)"
 			onkeyup="if (event.keyCode == event.DOM_VK_SPACE) { Zotero_Preferences.Sync.toggleLibraryToSync(this.currentIndex); }">
 			<treecols>
-				<treecol editable="true" type="checkbox" id="libraries-to-sync-checked" label="&zotero.preferences.sync.librariesToSync.sync;"/>
+				<treecol editable="false" id="libraries-to-sync-checked" label="&zotero.preferences.sync.librariesToSync.sync;"/>
 				<treecol editable="false" id="libraries-to-sync-name" flex="1" label="&zotero.preferences.sync.librariesToSync.library;"/>
 			</treecols>
 			<treechildren id="libraries-to-sync-rows"/>
diff --git a/chrome/content/zotero/preferences/preferences_sync.js b/chrome/content/zotero/preferences/preferences_sync.js
index b1dcf9fcca..eb524ab3e2 100644
--- a/chrome/content/zotero/preferences/preferences_sync.js
+++ b/chrome/content/zotero/preferences/preferences_sync.js
@@ -29,6 +29,9 @@ Components.utils.import("resource://gre/modules/osfile.jsm");
 Components.utils.import("resource://zotero/config.js");
 
 Zotero_Preferences.Sync = {
+	checkmarkChar: '\u2705',
+	noChar: '\uD83D\uDEAB',
+	
 	init: Zotero.Promise.coroutine(function* () {
 		this.updateStorageSettingsUI();
 		this.updateStorageSettingsGroupsUI();
@@ -273,6 +276,8 @@ Zotero_Preferences.Sync = {
 		Zotero.Prefs.set('sync.librariesToSkip', JSON.stringify(librariesToSkip));
 		 
 		var cell = row.firstChild.firstChild;
+		var spacing = Zotero.isMac ? '   ' : '  ';
+		cell.setAttribute('label', spacing + (indexOfId != -1 ? this.checkmarkChar : this.noChar));
 		cell.setAttribute('value', indexOfId != -1);
 	},
 	
@@ -284,7 +289,7 @@ Zotero_Preferences.Sync = {
 			treechildren.removeChild(treechildren.firstChild);
 		}
 		
-		function addRow(libraryName, id, checked=false, editable=true) {
+		var addRow = function (libraryName, id, checked=false, editable=true) {
 			var treeitem = document.createElement('treeitem');
 			var treerow = document.createElement('treerow');
 			var checkboxCell = document.createElement('treecell');
@@ -293,14 +298,19 @@ Zotero_Preferences.Sync = {
 			nameCell.setAttribute('label', libraryName);
 			nameCell.setAttribute('value', id);
 			nameCell.setAttribute('editable', false);
+			var spacing = Zotero.isMac ? '   ' : '  ';
+			checkboxCell.setAttribute(
+				'label',
+				id == 'loading' ? '' : (spacing + (checked ? this.checkmarkChar : this.noChar))
+			);
 			checkboxCell.setAttribute('value', checked);
-			checkboxCell.setAttribute('editable', editable);
+			checkboxCell.setAttribute('editable', false);
 			
 			treerow.appendChild(checkboxCell);
 			treerow.appendChild(nameCell);
 			treeitem.appendChild(treerow);
 			treechildren.appendChild(treeitem);
-		}
+		}.bind(this);
 		
 		// Add loading row while we're loading a group list
 		var loadingLabel = Zotero.getString("zotero.preferences.sync.librariesToSync.loadingLibraries");