diff --git a/app/helpers/export_helper.rb b/app/helpers/export_helper.rb
index 5d36c465f..d38255c44 100644
--- a/app/helpers/export_helper.rb
+++ b/app/helpers/export_helper.rb
@@ -543,7 +543,7 @@ module ExportHelper
   end
 
   def format_sheet_name name
-    name = name.gsub(":", "-")
+    name = name.gsub(":", "-").gsub("/", "_")
   end
 
   def rename_same_file(name, index)