diff --git a/bin/interpreter.sh b/bin/interpreter.sh
index b5a6d12346..d50c4c1781 100755
--- a/bin/interpreter.sh
+++ b/bin/interpreter.sh
@@ -82,7 +82,7 @@ if [[ "${INTERPRETER_ID}" == "spark" ]]; then
     export SPARK_SUBMIT="${SPARK_HOME}/bin/spark-submit"
     SPARK_APP_JAR="$(ls ${ZEPPELIN_HOME}/interpreter/spark/zeppelin-spark*.jar)"
     # This will evantually passes SPARK_APP_JAR to classpath of SparkIMain
-    ZEPPELIN_CLASSPATH=${SPARK_APP_JAR}
+    ZEPPELIN_CLASSPATH+=${SPARK_APP_JAR}
 
     pattern="$SPARK_HOME/python/lib/py4j-*-src.zip"
     py4j=($pattern)