diff --git a/Dockerfile b/Dockerfile
index d46866c..592a953 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -39,6 +39,6 @@ RUN \
   rm sbt-$(cat /sbt-version).rpm && \
   mkdir /project
 WORKDIR /project
-ENV SBT_OPTS="-XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=2G -Xmx2G -Xms1G"
+ENV SBT_OPTS="-XX:MaxPermSize=2G -Xmx2G -Xms1G"
 
 FROM conservative AS default