diff --git a/etherpad_to_optim/etherpad_to_optim.ant b/etherpad_to_optim/etherpad_to_optim.ant
index 675453e261c4d0c098ab147f4f21fa3e7fd04ddb..69653136a8dc19d8f230f3bf7991b54912c02f0b 100644
--- a/etherpad_to_optim/etherpad_to_optim.ant
+++ b/etherpad_to_optim/etherpad_to_optim.ant
@@ -26,7 +26,9 @@
             </fileset>
         </delete>
         <copy file="input/pad.html" todir="${eth_in}"/>
-        <exec dir="../etherpad_to_hdoc" executable="run.sh"/>
+        <exec executable="/bin/bash" dir="../etherpad_to_hdoc">
+            <arg value="../etherpad_to_hdoc/run.sh"/>
+        </exec>
     </target>
     
     <target name="to_optim_unix" if="${is_unix}">
@@ -36,7 +38,9 @@
             </fileset>
         </delete>
         <copy file="${eth_out}/pad.hdoc" todir="${opti_in}"/>
-        <exec dir="../hdoc_to_optim" executable="run.sh"/>
+        <exec executable="/bin/bash" dir="../hdoc_to_optim">
+            <arg value="../hdoc_to_optim/run.sh"/>
+        </exec>
         <copy file="${opti_out}/*.scar" todir="output"/>        
     </target>