diff --git a/update_dependencies.xml b/update_dependencies.xml
index 36346f53e2a..7eb747df061 100644
--- a/update_dependencies.xml
+++ b/update_dependencies.xml
@@ -205,6 +205,17 @@
              dest="dependencies/download/bootstrap-compiler.zip" usetimestamp="true"/>
         <delete dir="dependencies/bootstrap-compiler" failonerror="false"/>
         <unzip src="dependencies/download/bootstrap-compiler.zip" dest="dependencies/bootstrap-compiler"/>
+        <taskdef resource="net/sf/antcontrib/antcontrib.properties" classpath="${basedir}/dependencies/ant-contrib.jar"/>
+        <if>
+            <matches pattern="mac\.zip|tar\.gz" string="${os.tag}"/>
+            <then>
+                <!-- Java can't manipulate permissions -->
+                <exec executable="find">
+                    <arg value="dependencies/bootstrap-compiler/Kotlin/kotlinc/bin"/>
+                    <arg line="-name 'kotlin*' ! -name '*.bat' -exec chmod a+x '{}' ;"/>
+                </exec>
+            </then>
+        </if>
     </target>
 
     <macrodef name="get-asm-sources-and-rename-packages">