diff --git a/rasp_grid_cfg.py b/rasp_grid_cfg.py
index 368dea9..3e04d72 100644
--- a/rasp_grid_cfg.py
+++ b/rasp_grid_cfg.py
@@ -533,7 +533,7 @@ class MainWindow(QTabWidget):
         f.write('  TraceLength: 10s\n')
         f.write('\n')
         f.write('*Recording\n')
-        f.write('  PathFormat: "%04Y-%02m-%02d-%02H:%02M"\n')
+        f.write('  PathFormat: "%04Y-%02m-%02d-%02H_%02M"\n')
         f.write('\n')
         f.write('*Acquisition\n')
         f.write('  device1   : /dev/comedi0\n')