diff --git a/libretroshare/src/pqi/p3cfgmgr.h b/libretroshare/src/pqi/p3cfgmgr.h
index 27986f04a..43e19b66e 100644
--- a/libretroshare/src/pqi/p3cfgmgr.h
+++ b/libretroshare/src/pqi/p3cfgmgr.h
@@ -151,7 +151,7 @@ class p3ConfigMgr
 		/**
 		 * @param bdir base directory: where config files will be saved
 		 */
-        p3ConfigMgr(std::string bdir);
+	explicit p3ConfigMgr(std::string bdir);
 
         /**
          * checks and update all added configurations