diff --git a/ssg/controls.py b/ssg/controls.py
index a75d33d42db..b989edace49 100644
--- a/ssg/controls.py
+++ b/ssg/controls.py
@@ -185,7 +185,7 @@ def add_references(self, reference_type, rules):
                 continue
             try:
                 rule.add_extra_reference(reference_type, self.id)
-            except Exception as exc:
+            except ValueError as exc:
                 msg = (
                     "Please remove any duplicate listing of rule '%s' in "
                     "control '%s'." % (