diff --git a/chrome/content/zotero/xpcom/utilities_internal.js b/chrome/content/zotero/xpcom/utilities_internal.js
index 31b93cf189..d8617babbc 100644
--- a/chrome/content/zotero/xpcom/utilities_internal.js
+++ b/chrome/content/zotero/xpcom/utilities_internal.js
@@ -1823,13 +1823,6 @@ Zotero.Utilities.Internal = {
 		};
 	},
 	
-	spawn: function (generator, thisObject) {
-		if (thisObject) {
-			return generator.bind(thisObject)();
-		}
-		return generator();
-	},
-
 	/**
 	 * Defines property on the object
 	 * More compact way to do Object.defineProperty
diff --git a/chrome/content/zotero/xpcom/zotero.js b/chrome/content/zotero/xpcom/zotero.js
index 508eae7618..0daea6d5ec 100644
--- a/chrome/content/zotero/xpcom/zotero.js
+++ b/chrome/content/zotero/xpcom/zotero.js
@@ -1582,10 +1582,6 @@ const { CommandLineOptions } = ChromeUtils.importESModule("chrome://zotero/conte
 		return Zotero.Utilities.Internal.serial(fn);
 	}
 	
-	this.spawn = function (generator, thisObject) {
-		return Zotero.Utilities.Internal.spawn(generator, thisObject);
-	}
-	
 	/**
 	 * Show Zotero pane overlay and progress bar in all windows
 	 *