diff --git a/utils/jks2pem b/utils/jks2pem
index 7d39876..9c0fdb7 100755
--- a/utils/jks2pem
+++ b/utils/jks2pem
@@ -1,21 +1,23 @@
-#!/bin/bash
-# --------------------------------------
-# converts a java keystore file to PEM
-# requires: jdk and openssl
-# --------------------------------------
-# thanks to: 
-# https://www.calazan.com/how-to-convert-a-java-keystore-jks-to-pem-format/
-# --------------------------------------
-
-JKSFILE=$1
-PEMFILE=$2
-
-keytool -importkeystore \
-        -srckeystore ${JKSFILE} \
-        -destkeystore ${JKSFILE}.p12 \
-        -srcstoretype jks \
-        -deststoretype pkcs12
-
-openssl pkcs12 \
-        -in ${JKSFILE}.p12 
-        -out $PEMFILE
+#!/bin/sh
+# --------------------------------------
+# converts a java keystore file to PEM
+# requires: jdk and openssl
+# --------------------------------------
+# thanks to:
+# https://www.calazan.com/how-to-convert-a-java-keystore-jks-to-pem-format/
+# --------------------------------------
+
+JKSFILE="$1"
+PEMFILE="$2"
+
+keytool -importkeystore \
+        -srckeystore "${JKSFILE}" \
+        -destkeystore "${JKSFILE}.p12" \
+        -srcstoretype jks \
+        -deststoretype pkcs12
+
+openssl pkcs12 \
+        -in "${JKSFILE}.p12" \
+        -out "$PEMFILE"
+
+rm -i "${JKSFILE}.p12"