diff --git a/.travis.yml b/.travis.yml
index 594033ea8..50ddbc04c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -29,7 +29,7 @@ before_script:
        export CC65_HOME=/tmp/cc65/ && cc65 --version || true"
 
   ## Compile cooja.jar only when it's going to be needed
-  - "[ ${BUILD_CATEGORY:-sim} = sim ] && java -version && ant -q -f tools/cooja/build.xml jar || true"
+  - "[ ${BUILD_CATEGORY:-sim} = sim ] && java -version && ant -q -f tools/cooja/build.xml jar && sudo java -Xshare:dump -version || true"
 
   ## IMPORTANT: The commands here have to end with `|| true`,
   ## because it would make the test fail if BUILD_TYPE test fails