diff --git a/modules/libcom/src/fdmgr/fdManager.cpp b/modules/libcom/src/fdmgr/fdManager.cpp
index c6fa05fc5..58917b4c7 100644
--- a/modules/libcom/src/fdmgr/fdManager.cpp
+++ b/modules/libcom/src/fdmgr/fdManager.cpp
@@ -75,7 +75,7 @@ struct fdManagerPrivate {
     fdReg * pCBReg;
     fdManager & owner;
 
-    fdManagerPrivate(fdManager & owner);
+    explicit fdManagerPrivate(fdManager & owner);
     void lazyInitTimerQueue();
 };