diff --git a/search/Property.cc b/search/Property.cc
index 89974166..1ec9616d 100644
--- a/search/Property.cc
+++ b/search/Property.cc
@@ -617,6 +617,7 @@ PropertyValue::asString(const Network *network) const
   case Type::type_pwr_activity:
     return nullptr;
   }
+  return nullptr;
 }
 
 ////////////////////////////////////////////////////////////////