diff --git a/chrome/content/zotero/xpcom/data/dataObjects.js b/chrome/content/zotero/xpcom/data/dataObjects.js
index 2dd1eae12b..edbfb5dc9b 100644
--- a/chrome/content/zotero/xpcom/data/dataObjects.js
+++ b/chrome/content/zotero/xpcom/data/dataObjects.js
@@ -448,7 +448,9 @@ Zotero.DataObjects.prototype.updateVersion = Zotero.Promise.method(function (ids
 	let sql = "UPDATE " + this.table + " SET version=" + version + " "
 		+ "WHERE " + this.idColumn + " IN (";
 	return Zotero.Utilities.Internal.forEachChunkAsync(
-		ids, Zotero.DB.MAX_BOUND_PARAMETERS, Zotero.Promise.coroutine(function* (chunk) {
+		ids,
+		Zotero.DB.MAX_BOUND_PARAMETERS,
+		function* (chunk) {
 			yield Zotero.DB.queryAsync(sql + chunk.map(() => '?').join(', ') + ')', chunk);
 			// Update the internal 'version' property of any loaded objects
 			for (let i = 0; i < chunk.length; i++) {
@@ -458,7 +460,7 @@ Zotero.DataObjects.prototype.updateVersion = Zotero.Promise.method(function (ids
 					obj.updateVersion(version, true);
 				}
 			}
-		}.bind(this))
+		}.bind(this)
 	);
 });
 
@@ -473,7 +475,9 @@ Zotero.DataObjects.prototype.updateSynced = Zotero.Promise.method(function (ids,
 	let sql = "UPDATE " + this.table + " SET synced=" + (synced ? 1 : 0) + " "
 		+ "WHERE " + this.idColumn + " IN (";
 	return Zotero.Utilities.Internal.forEachChunkAsync(
-		ids, Zotero.DB.MAX_BOUND_PARAMETERS, Zotero.Promise.coroutine(function* (chunk) {
+		ids,
+		Zotero.DB.MAX_BOUND_PARAMETERS,
+		function* (chunk) {
 			yield Zotero.DB.queryAsync(sql + chunk.map(() => '?').join(', ') + ')', chunk);
 			// Update the internal 'synced' property of any loaded objects
 			for (let i = 0; i < chunk.length; i++) {
@@ -483,7 +487,7 @@ Zotero.DataObjects.prototype.updateSynced = Zotero.Promise.method(function (ids,
 					obj.updateSynced(!!synced, true);
 				}
 			}
-		}.bind(this))
+		}.bind(this)
 	);
 });
 
diff --git a/chrome/content/zotero/xpcom/data/tags.js b/chrome/content/zotero/xpcom/data/tags.js
index c500cd4c4a..31598722b4 100644
--- a/chrome/content/zotero/xpcom/data/tags.js
+++ b/chrome/content/zotero/xpcom/data/tags.js
@@ -252,7 +252,7 @@ Zotero.Tags = new function() {
 			yield Zotero.Utilities.Internal.forEachChunkAsync(
 				oldItemIDs,
 				Zotero.DB.MAX_BOUND_PARAMETERS - 2,
-				Zotero.Promise.coroutine(function* (chunk) {
+				function* (chunk) {
 					let placeholders = chunk.map(function () '?').join(',');
 					
 					// This is ugly, but it's much faster than doing replaceTag() for each item
@@ -265,7 +265,7 @@ Zotero.Tags = new function() {
 					yield Zotero.DB.queryAsync(sql, [Zotero.DB.transactionDateTime].concat(chunk));
 					
 					yield Zotero.Items.reload(oldItemIDs, ['tags'], true);
-				})
+				}
 			);
 			
 			var notifierData = {};
@@ -331,7 +331,7 @@ Zotero.Tags = new function() {
 			yield Zotero.Utilities.Internal.forEachChunkAsync(
 				Zotero.Utilities.arrayUnique(oldItemIDs),
 				Zotero.DB.MAX_BOUND_PARAMETERS - 1,
-				Zotero.Promise.coroutine(function* (chunk) {
+				function* (chunk) {
 					let placeholders = chunk.map(function () '?').join(',');
 					
 					sql = 'UPDATE items SET clientDateModified=? '
@@ -339,7 +339,7 @@ Zotero.Tags = new function() {
 					yield Zotero.DB.queryAsync(sql, [Zotero.DB.transactionDateTime].concat(chunk));
 					
 					yield Zotero.Items.reload(oldItemIDs, ['tags']);
-				})
+				}
 			);
 		}.bind(this));
 		
diff --git a/chrome/content/zotero/xpcom/utilities_internal.js b/chrome/content/zotero/xpcom/utilities_internal.js
index 656057f375..5b57071fe4 100644
--- a/chrome/content/zotero/xpcom/utilities_internal.js
+++ b/chrome/content/zotero/xpcom/utilities_internal.js
@@ -35,7 +35,8 @@ Zotero.Utilities.Internal = {
 	 *
 	 * @param {Array} arr
 	 * @param {Integer} chunkSize
-	 * @param {Function} func - A promise-returning function
+	 * @param {Function|GeneratorFunction} func - A promise-returning function or a
+	 *                                            promise-yielding generator
 	 * @return {Array} The return values from the successive runs
 	 */
 	"forEachChunkAsync": Zotero.Promise.coroutine(function* (arr, chunkSize, func) {
@@ -44,6 +45,8 @@ Zotero.Utilities.Internal = {
 		var num = arr.length;
 		var done = 0;
 		
+		func = Zotero.Promise.coroutine(func);
+		
 		do {
 			var chunk = tmpArray.splice(0, chunkSize);
 			done += chunk.length;