diff --git a/loader/expression.fifty.ts b/loader/expression.fifty.ts
index 971bbf7d7..1c71aa75b 100644
--- a/loader/expression.fifty.ts
+++ b/loader/expression.fifty.ts
@@ -530,7 +530,7 @@ namespace slime {
 				/**
 				 * Creates a *Loader*. A Loader loads resources from a specified source.
 				 */
-				Loader: loader.old.Constructor
+				Loader: loader.old.Constructor & slime.runtime.internal.old_loaders.Exports["api"]
 			}
 		}
 
diff --git a/loader/expression.js b/loader/expression.js
index 428cef26f..079c2ec76 100644
--- a/loader/expression.js
+++ b/loader/expression.js
@@ -309,8 +309,7 @@
 				},
 				Resource: ResourceExport,
 				old: {
-					//	TODO	the static type definition for this lacks the properties added by `loaders` -- are they necessary?
-					Loader: Object.assign(loaders.constructor, loaders, { constructor: null }),
+					Loader: Object.assign(loaders.constructor, loaders.api, { constructor: null }),
 					loader: loaders.api
 				},
 				compiler: {
diff --git a/loader/jrunscript/expression.js b/loader/jrunscript/expression.js
index 2e55a0d20..9f31d1394 100644
--- a/loader/jrunscript/expression.js
+++ b/loader/jrunscript/expression.js
@@ -899,37 +899,38 @@
 			 * @param { slime.runtime.Exports["old"]["Loader"] } was
 			 * @returns
 			 */
-			function(was/*,api*/) {
+			function(was) {
 				/**
-				 * @this { slime.old.Loader }
+				 * @type { slime.runtime.exports.Old["Loader"] }
 				 */
-				var rv = function(p) {
-					if (!p) throw new TypeError("source argument required for Loader.");
-
-					//	Satisfy TypeScript
-					this.source = void(0);
-					this.run = void(0);
-					this.value = void(0);
-					this.file = void(0);
-					this.module = void(0);
-					this.script = void(0);
-					this.factory = void(0);
-					this.Child = void(0);
-					this.get = void(0);
-					this.toSynchronous = void(0);
-
-					var source = adaptLoaderArgument(p);
-
-					was.call(this,source);
-				};
-				// //	Satisfy TypeScript by adding properties that will be added by Object.assign below
-				// rv.source = void(0);
-				// rv.series = void(0);
-				// rv.tools = void(0);
-				// Object.assign(rv, api);
+				var rv = Object.assign(
+					/**
+					 * @this { slime.old.Loader }
+					 */
+					function(p) {
+						if (!p) throw new TypeError("source argument required for Loader.");
+
+						//	Satisfy TypeScript
+						this.source = void(0);
+						this.run = void(0);
+						this.value = void(0);
+						this.file = void(0);
+						this.module = void(0);
+						this.script = void(0);
+						this.factory = void(0);
+						this.Child = void(0);
+						this.get = void(0);
+						this.toSynchronous = void(0);
+
+						var source = adaptLoaderArgument(p);
+
+						was.call(this,source);
+					},
+					was
+				);
 				return rv;
 			}
-		)(slime.old.Loader/*, slime.old.Loader["api"]*/);
+		)(slime.old.Loader);
 
 		var $exports_classpath = (
 			/**