diff --git a/build/build.node.ts b/build/build.node.ts
index 8e4f67bb6f3..533abcf9977 100644
--- a/build/build.node.ts
+++ b/build/build.node.ts
@@ -1016,7 +1016,7 @@ namespace $ {
 			var target = pack.resolve( `-/${bundle}.test.js` )
 			var targetMap = pack.resolve( `-/${bundle}.test.js.map` )
 			
-			var concater = new $mol_sourcemap_builder( target.parent().path(), ';')
+			var concater = new $mol_sourcemap_builder( this.root().relate( target.parent() ), ';')
 			concater.add( '"use strict"' )
 			
 			var exclude_ext = exclude.filter( ex => ex !== 'test' && ex !== 'dev' )
@@ -1041,7 +1041,7 @@ namespace $ {
 					}
 					try {
 						const content = this.js_content( src.path() )
-						concater.add( content.text, src.relate( target.parent() ), content.map)
+						concater.add( content.text, '', content.map)
 					} catch( error: any ) {
 						errors.push( error )
 					}