diff --git a/libretroshare/src/gxs/rsgxsdataaccess.h b/libretroshare/src/gxs/rsgxsdataaccess.h
index 04a785286..ef132dc0e 100644
--- a/libretroshare/src/gxs/rsgxsdataaccess.h
+++ b/libretroshare/src/gxs/rsgxsdataaccess.h
@@ -37,7 +37,7 @@ typedef std::map< RsGxsGroupId, RsGxsGrpMetaData* > GrpMetaFilter;
 class RsGxsDataAccess : public RsTokenService
 {
 public:
-    RsGxsDataAccess(RsGeneralDataService* ds);
+    explicit RsGxsDataAccess(RsGeneralDataService* ds);
     virtual ~RsGxsDataAccess() ;
 
 public: