diff --git a/build.xml b/build.xml
index 18fd25a1fa6..53319c75292 100644
--- a/build.xml
+++ b/build.xml
@@ -193,7 +193,7 @@
             <fileset dir="core/util.runtime/src"/>
             <fileset dir="compiler/backend/src"/>
             <fileset dir="compiler/backend-common/src"/>
-            <fileset dir="compiler/builtins-serializer"/>
+            <fileset dir="compiler/builtins-serializer/src"/>
             <fileset dir="compiler/cli/src"/>
             <fileset dir="compiler/cli/cli-common/src"/>
             <fileset dir="compiler/frontend/src"/>