diff --git a/pyspark-notebook/Dockerfile b/pyspark-notebook/Dockerfile
index a8241ed5..bf2f601b 100644
--- a/pyspark-notebook/Dockerfile
+++ b/pyspark-notebook/Dockerfile
@@ -52,8 +52,8 @@ RUN ln -s "spark-${APACHE_SPARK_VERSION}-bin-hadoop${HADOOP_VERSION}" spark && \
 # Fix Spark installation for Java 11 and Apache Arrow library
 # see: https://github.com/apache/spark/pull/27356, https://spark.apache.org/docs/latest/#downloading
 RUN cp -p "$SPARK_HOME/conf/spark-defaults.conf.template" "$SPARK_HOME/conf/spark-defaults.conf" && \
-    echo 'spark.driver.extraJavaOptions="-Dio.netty.tryReflectionSetAccessible=true"' >> $SPARK_HOME/conf/spark-defaults.conf && \
-    echo 'spark.executor.extraJavaOptions="-Dio.netty.tryReflectionSetAccessible=true"' >> $SPARK_HOME/conf/spark-defaults.conf
+    echo 'spark.driver.extraJavaOptions -Dio.netty.tryReflectionSetAccessible=true' >> $SPARK_HOME/conf/spark-defaults.conf && \
+    echo 'spark.executor.extraJavaOptions -Dio.netty.tryReflectionSetAccessible=true' >> $SPARK_HOME/conf/spark-defaults.conf
 
 USER $NB_UID