diff --git a/configure b/configure
index 4cd15fbb..70fd677f 100755
--- a/configure
+++ b/configure
@@ -487,8 +487,8 @@ def create_ninja_and_rc(l_installed):
         'export IRPF90={0}'.format(path_irpf90.replace(QP_ROOT,"${QP_ROOT}")),
         'export NINJA={0}'.format(path_ninja.replace(QP_ROOT,"${QP_ROOT}")),
         'qp_append_export () {',
-        '   #Append path $2:${!1}. Add the semicolon only if ${!1} is defined' 
-        '   echo ${2}${!1:+:${!1}}'
+        '   #Append path $2:${!1}. Add the semicolon only if ${!1} is defined',
+        '   echo ${2}${!1:+:${!1}}',
         '}',
         'export PYTHONPATH=$(qp_append_export "PYTHONPATH" "${QP_EZFIO}/Python":"${QP_PYTHON}")',
         'export PATH=$(qp_append_export "PATH" "${QP_PYTHON}":"${QP_ROOT}"/bin:"${QP_ROOT}"/ocaml)',