diff --git a/build.xml b/build.xml
index 3629d47feb7..29460f55ac2 100644
--- a/build.xml
+++ b/build.xml
@@ -551,7 +551,10 @@
 
         <javac2 destdir="${output}/classes/compiler" debug="true" debuglevel="lines,vars,source" includeAntRuntime="false"
                 source="${java.target}" target="${java.target}">
-            <withKotlin modulename="kotlin-compiler"/>
+            <withKotlin modulename="kotlin-compiler">
+                <!-- remove after bootstrapping packages -->
+                <compilerarg value="-Xallow-kotlin-package"/>
+            </withKotlin>
             <skip pattern="kotlin/jvm/internal/.*"/>
             <skip pattern="kotlin/Metadata"/>
             <src refid="compilerSources.path"/>