--- a/Plugins/VcsPlugins/vcsMercurial/ShelveExtension/HgShelveDataDialog.py	Wed Mar 19 18:47:05 2014 +0100
+++ b/Plugins/VcsPlugins/vcsMercurial/ShelveExtension/HgShelveDataDialog.py	Wed Mar 19 19:26:30 2014 +0100
@@ -45,7 +45,7 @@
         else:
             dateTime = QDateTime()
         return (
-            self.nameEdit.text(),
+            self.nameEdit.text().replace(" ", "_"),
             dateTime,
             self.messageEdit.text(),
             self.addRemoveCheckBox.isChecked(),