diff --git a/snap-engine-kit/src/main/assembly/bin/gpt.sh b/snap-engine-kit/src/main/assembly/bin/gpt.sh
old mode 100644
new mode 100755
index 9c361445a90..8994555d355
--- a/snap-engine-kit/src/main/assembly/bin/gpt.sh
+++ b/snap-engine-kit/src/main/assembly/bin/gpt.sh
@@ -1,2 +1,4 @@
-#!/bin/sh
-java -cp "../modules/*:../lib/*" -Dsnap.mainClass=org.esa.snap.core.gpf.main.GPT -Dsnap.home="../" -Xmx4G org.esa.snap.runtime.Launcher "$@"
\ No newline at end of file
+#!/bin/sh -x
+set -e
+CUR_DIR="$( cd -P "$( dirname "$0" )" && pwd )"
+java -cp "$CUR_DIR/modules/*:$CUR_DIR/lib/*" -Dsnap.mainClass=org.esa.snap.core.gpf.main.GPT -Dsnap.home="$HOME/.snap" -Djava.net.useSystemProxies=true -Xmx4G org.esa.snap.runtime.Launcher "$@"