diff --git a/Dockerfile b/Dockerfile
index 1849f97..33b3615 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -34,7 +34,7 @@ RUN sed -i -e 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen && \
 
 ENV PATH="/root/.cargo/bin:${PATH}"
 
-ENV JAVA_OPTS="jdk.lang.Process.launchMechanism=vfork"
+ENV JAVA_OPTS="-Djdk.lang.Process.launchMechanism=vfork"
 
 ENV LANG en_US.UTF-8