--- a/Plugins/VcsPlugins/vcsMercurial/BookmarksExtension/HgBookmarkDialog.py	Wed Mar 19 18:47:05 2014 +0100
+++ b/Plugins/VcsPlugins/vcsMercurial/BookmarksExtension/HgBookmarkDialog.py	Wed Mar 19 19:26:30 2014 +0100
@@ -203,8 +203,8 @@
             rev = ""
         
         if self.__mode == self.MOVE_MODE:
-            name = self.nameCombo.currentText()
+            name = self.nameCombo.currentText().replace(" ", "_")
         else:
-            name = self.nameEdit.text()
+            name = self.nameEdit.text().replace(" ", "_")
         
         return rev, name