--- a/Plugins/VcsPlugins/vcsMercurial/HgTagDialog.py	Wed Mar 19 18:47:05 2014 +0100
+++ b/Plugins/VcsPlugins/vcsMercurial/HgTagDialog.py	Wed Mar 19 19:26:30 2014 +0100
@@ -91,7 +91,7 @@
         
         @return tuple of two strings and int (tag, revision, tag operation)
         """
-        tag = self.tagCombo.currentText()
+        tag = self.tagCombo.currentText().replace(" ", "_")
         tagOp = 0
         if self.createTagButton.isChecked():
             if self.globalTagButton.isChecked():