diff --git a/src/script.h b/src/script.h
index 7cb863d1c..1e2cc94ef 100644
--- a/src/script.h
+++ b/src/script.h
@@ -730,6 +730,12 @@ public:
     {
         return CScriptID(Hash160(*this));
     }
+
+    void clear()
+    {
+        // The default std::vector::clear() does not release memory.
+        std::vector<unsigned char>().swap(*this);
+    }
 };
 
 /** Compact serializer for scripts.