diff --git a/src/Products/SiteAccess/VirtualHostMonster.py b/src/Products/SiteAccess/VirtualHostMonster.py
index 7dae9e7000..23bfc2c1f0 100644
--- a/src/Products/SiteAccess/VirtualHostMonster.py
+++ b/src/Products/SiteAccess/VirtualHostMonster.py
@@ -104,7 +104,7 @@ def set_map(self, map_text, RESPONSE=None):
                 if hostname not in host_map:
                     host_map[hostname] = {}
                 host_map[hostname][port] = pp
-            except Exception as msg:
+            except ValueError as msg:
                 line = '%s #! %s' % (line, msg)
             new_lines.append(line)
         self.lines = tuple(new_lines)