diff --git a/fishgrid.cfg b/fishgrid.cfg
index b857581..06838c9 100644
--- a/fishgrid.cfg
+++ b/fishgrid.cfg
@@ -66,7 +66,7 @@
   TraceLength: 10s
 
 *Recording
-  PathFormat: "%04Y-%02m-%02d-%02H:%02M"
+  PathFormat: "%04Y-%02m-%02d-%02H_%02M"
 
 *Acquisition
   device1   : /dev/comedi0