diff --git a/src/clzones.h b/src/clzones.h
index db3485286b61b..de0f646828510 100644
--- a/src/clzones.h
+++ b/src/clzones.h
@@ -39,7 +39,7 @@ class zone_type
     public:
 
         zone_type_id id;
-        bool was_loaded;
+        bool was_loaded = false;
 
         zone_type() = default;
         explicit zone_type( const std::string &name, const std::string &desc ) : name_( name ),