diff --git a/packaging/scripts/post_install.sh b/packaging/scripts/post_install.sh
index 3dc0c56..fa0a972 100644
--- a/packaging/scripts/post_install.sh
+++ b/packaging/scripts/post_install.sh
@@ -21,13 +21,13 @@ virtualenv <%= install_path %>/env
 
 cat > /usr/local/bin/artifice-bill <<EOF
 #!/bin/bash
-<%=install_path%>/env/bin/python <%=install_path%>/bin/bill.py $@
-
+<%=install_path%>/env/bin/python <%=install_path%>/bin/bill.py \$@
 EOF
+chmod +x /usr/local/bin/artifice-bill
 
 cat > /usr/local/bin/artifice-usage <<EOF
 #!/bin/bash
-<%=install_path%>/env/bin/python <%=install_path%>/bin/usage.py $@
+<%=install_path%>/env/bin/python <%=install_path%>/bin/usage.py \$@
 EOF
-
+chmod +x /usr/local/bin/artifice-usage