diff --git a/cal_tools/cal_tools/tools.py b/cal_tools/cal_tools/tools.py
index efeaf41ab230f0bf2d64952c1c46ca98fe61a8ce..042151430a6495baee5ba7b3d24838847d08ddce 100644
--- a/cal_tools/cal_tools/tools.py
+++ b/cal_tools/cal_tools/tools.py
@@ -129,7 +129,7 @@ def make_report(run_path, tmp_path, out_path, project, author, version, report_t
             if ext == ".rst" and "index" not in name:
                 files_to_handle.append(name.strip())
 
-    indexTmp = Template('''
+    index_tmp = Template('''
                         Calibration report
                         ==================
                         
@@ -141,7 +141,7 @@ def make_report(run_path, tmp_path, out_path, project, author, version, report_t
                         ''')
 
     with open("{}/index.rst".format(run_path), "w+") as mf:
-        mf.write(textwrap.dedent(indexTmp.render(keys=files_to_handle)))
+        mf.write(textwrap.dedent(index_tmp.render(keys=files_to_handle)))
 
     # finally call the make scripts
     os.chdir(run_path)