--- a/Plugins/VcsPlugins/vcsMercurial/ShelveExtension/HgUnshelveDataDialog.py	Wed Mar 19 18:47:05 2014 +0100
+++ b/Plugins/VcsPlugins/vcsMercurial/ShelveExtension/HgUnshelveDataDialog.py	Wed Mar 19 19:26:30 2014 +0100
@@ -45,6 +45,6 @@
             to keep the shelved change (boolean)
         """
         return (
-            self.nameComboBox.currentText(),
+            self.nameComboBox.currentText().replace(" ", "_"),
             self.keepCheckBox.isChecked()
         )