diff --git a/src/etc/testcases/taskdefs/optional/dotnet.xml b/src/etc/testcases/taskdefs/optional/dotnet.xml
index a47ae5393..d50f6fc08 100644
--- a/src/etc/testcases/taskdefs/optional/dotnet.xml
+++ b/src/etc/testcases/taskdefs/optional/dotnet.xml
@@ -116,7 +116,9 @@
     </csc>
     <available property="app.created" file="${testCSC.exe}"/>
     <fail unless="app.created">No app ${testCSC.exe} created</fail>
-    <exec executable="${testCSC.exe}" failonerror="true" />
+    <exec executable="mono" failonerror="true">
+      <arg value="${testCSC.exe}"/>
+    </exec> 
     <delete file="${testCSC.exe}"/>
   </target>