diff --git a/src/HomeSpan.cpp b/src/HomeSpan.cpp
index c7f6d77..1d0aba7 100644
--- a/src/HomeSpan.cpp
+++ b/src/HomeSpan.cpp
@@ -1459,6 +1459,9 @@ void SpanService::validate(){
       homeSpan.configLog+=" *** WARNING!  Required Characteristic for this Service not found. ***\n";
     }
   }
+
+  vector<HapChar *>().swap(opt);
+  vector<HapChar *>().swap(req);
 }
 
 ///////////////////////////////