diff --git a/chrome/content/zotero/preferences/preferences_sync.js b/chrome/content/zotero/preferences/preferences_sync.js
index de50bcc38..759a5b8e2 100644
--- a/chrome/content/zotero/preferences/preferences_sync.js
+++ b/chrome/content/zotero/preferences/preferences_sync.js
@@ -494,7 +494,7 @@ Zotero_Preferences.Sync = {
 	},
 	
 	
-	handleSyncReset: function (action) {
+	handleSyncReset: Zotero.Promise.coroutine(function* (action) {
 		var ps = Components.classes["@mozilla.org/embedcomp/prompt-service;1"]
 								.getService(Components.interfaces.nsIPromptService);
 		
@@ -509,9 +509,44 @@ Zotero_Preferences.Sync = {
 			return;
 		}
 		
-		var account = Zotero.Sync.Server.username;
-		
 		switch (action) {
+			case 'full-sync':
+				var buttonFlags = (ps.BUTTON_POS_0) * (ps.BUTTON_TITLE_IS_STRING)
+					+ (ps.BUTTON_POS_1) * (ps.BUTTON_TITLE_CANCEL)
+					+ ps.BUTTON_POS_1_DEFAULT;
+				var index = ps.confirmEx(
+					null,
+					// TODO: localize
+					Zotero.getString('general.warning'),
+					"Zotero will compare all local and remote data and merge any data that does not "
+						+ "exist in both locations.\n\n"
+						+ "This option is not necessary during normal usage and should "
+						+ "generally be used only to troubleshoot specific issues as recommended "
+						+ "by Zotero support staff.",
+					buttonFlags,
+					"Sync",
+					null, null, null, {}
+				);
+				
+				switch (index) {
+				case 0:
+					let libraries = Zotero.Libraries.getAll().filter(library => library.syncable);
+					yield Zotero.DB.executeTransaction(function* () {
+						for (let library of libraries) {
+							library.libraryVersion = -1;
+							yield library.save();
+						}
+					});
+					yield Zotero.Sync.Runner.sync();
+					break;
+					
+					// Cancel
+				case 1:
+					return;
+				}
+				
+				break;
+			
 			case 'restore-from-server':
 				var buttonFlags = (ps.BUTTON_POS_0) * (ps.BUTTON_TITLE_IS_STRING)
 									+ (ps.BUTTON_POS_1) * (ps.BUTTON_TITLE_CANCEL)
@@ -659,5 +694,5 @@ Zotero_Preferences.Sync = {
 			default:
 				throw ("Invalid action '" + action + "' in handleSyncReset()");
 		}
-	}
+	})
 };
diff --git a/chrome/content/zotero/preferences/preferences_sync.xul b/chrome/content/zotero/preferences/preferences_sync.xul
index 57b5b6987..88b2f426a 100644
--- a/chrome/content/zotero/preferences/preferences_sync.xul
+++ b/chrome/content/zotero/preferences/preferences_sync.xul
@@ -282,6 +282,7 @@
 								</columns>
 								
 								<rows>
+									<!--
 									<row id="zotero-restore-from-server" selected="true">
 										<radio/>
 										<vbox onclick="this.previousSibling.click()">
@@ -297,6 +298,14 @@
 											<description>&zotero.preferences.sync.reset.restoreToServer.desc;</description>
 										</vbox>
 									</row>
+									-->
+									<row id="zotero-full-sync">
+										<radio/>
+										<vbox onclick="this.previousSibling.click()">
+											<label value="&zotero.preferences.sync.reset.fullSync;"/>
+											<description>&zotero.preferences.sync.reset.fullSync.desc;</description>
+										</vbox>
+									</row>
 								</rows>
 							</grid>
 							
diff --git a/chrome/content/zotero/xpcom/sync/syncEngine.js b/chrome/content/zotero/xpcom/sync/syncEngine.js
index da0fb18fb..82306cc8d 100644
--- a/chrome/content/zotero/xpcom/sync/syncEngine.js
+++ b/chrome/content/zotero/xpcom/sync/syncEngine.js
@@ -1160,8 +1160,8 @@ Zotero.Sync.Data.Engine.prototype._upgradeCheck = Zotero.Promise.coroutine(funct
  * Perform a full sync
  *
  * Get all object versions from the API and compare to the local database. If any objects are
- * missing or outdated and not up-to-date in the sync cache, download them. If any local objects
- * are marked as synced but aren't available remotely, mark them as unsynced for later uploading.
+ * missing or outdated, download them. If any local objects are marked as synced but aren't available
+ * remotely, mark them as unsynced for later uploading.
  *
  * (Technically this isn't a full sync on its own, because local objects are only flagged for later
  * upload.)
diff --git a/chrome/locale/en-US/zotero/preferences.dtd b/chrome/locale/en-US/zotero/preferences.dtd
index 2e386e96d..df99093f8 100644
--- a/chrome/locale/en-US/zotero/preferences.dtd
+++ b/chrome/locale/en-US/zotero/preferences.dtd
@@ -77,8 +77,8 @@
 <!ENTITY zotero.preferences.sync.reset.warning1						"The following operations are for use only in rare, specific situations and should not be used for general troubleshooting. In many cases, resetting will cause additional problems. See ">
 <!ENTITY zotero.preferences.sync.reset.warning2						"Sync Reset Options">
 <!ENTITY zotero.preferences.sync.reset.warning3						" for more information.">
-<!ENTITY zotero.preferences.sync.reset.fullSync					"Full Sync with Zotero Server">
-<!ENTITY zotero.preferences.sync.reset.fullSync.desc				"Merge local Zotero data with data from the sync server, ignoring sync history.">
+<!ENTITY zotero.preferences.sync.reset.fullSync					"Full Sync">
+<!ENTITY zotero.preferences.sync.reset.fullSync.desc				"Merge local data with data from server, ignoring sync history.">
 <!ENTITY zotero.preferences.sync.reset.restoreFromServer			"Restore from Zotero Server">
 <!ENTITY zotero.preferences.sync.reset.restoreFromServer.desc		"Erase all local Zotero data and restore from the sync server.">
 <!ENTITY zotero.preferences.sync.reset.restoreToServer				"Restore to Zotero Server">