diff --git a/entrypoint.sh b/entrypoint.sh
index 47da2c4..ed2ae5a 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -1,4 +1,9 @@
 #!/bin/sh -l
 Xvfb -screen 0 800x600x16 -ac &
+
 cd $GITHUB_WORKSPACE
+
+DIR="$( pwd )"
+sed -i "s#addToClassPath: '.*'#addToClassPath: \'$DIR/Java-Toolbuilder/src\'#g" $DIR"/squeak-smalltalk-packages/Toolbuilder-Java.package/JavaToolBuilder.class/class/addJavaClasses.st"
+
 /smalltalkCI/run.sh
\ No newline at end of file