diff --git a/build.sh b/build.sh
index fdf454d..9996a06 100755
--- a/build.sh
+++ b/build.sh
@@ -48,7 +48,7 @@ do
 
     # Clone and copy the repository
     rm -rfv "$(basename "$git" .git)"
-    rsa_filename=`/etc/lixonet/${netname}/$(basename "$git" .git).key`
+    rsa_filename="/etc/lixonet/${netname}/$(basename "$git" .git).key"
     if [ ! -f $rsa_filename ]; then rsa_filename="/etc/lixonet/${netname}/id_rsa"; fi
     echo "Using SSH key: $rsa_filename"
     GIT_SSH_COMMAND="ssh -i $rsa_filename -o IdentitiesOnly=yes" git clone $git || { echo "clone $git failed, quitting" ; exit 1; }
@@ -57,7 +57,7 @@ do
     for addon_git in `echo "$addons" | tr "," "\n"`
     do
     	rm -rfv "$(basename "$addon_git" .git)"     	
-	rsa_filename=`/etc/lixonet/${netname}/$(basename "$addon_git" .git).key`
+	rsa_filename="/etc/lixonet/${netname}/$(basename "$addon_git" .git).key"
 	if [ ! -f $rsa_filename ]; then rsa_filename="/etc/lixonet/${netname}/id_rsa"; fi
     	echo "Using SSH key: $rsa_filename"
 	GIT_SSH_COMMAND="ssh -i $rsa_filename -o IdentitiesOnly=yes" git clone $addon_git || { echo "clone addon $addon_git failed, quitting" ; exit 1; }