diff --git a/imagedumper.go b/imagedumper.go
index 327e4854c..625379b1d 100644
--- a/imagedumper.go
+++ b/imagedumper.go
@@ -26,7 +26,7 @@ import (
 )
 
 func datetimeForFilename() string {
-	const datetimeFormat = "20060102030405"
+	const datetimeFormat = "20060102150405"
 	now := time.Now()
 	return now.Format(datetimeFormat)
 }