diff --git a/core/AmSdp.h b/core/AmSdp.h
index 4b82c373..df536efa 100644
--- a/core/AmSdp.h
+++ b/core/AmSdp.h
@@ -192,7 +192,7 @@ struct SdpMedia
 
   bool operator == (const SdpMedia& other) const;
 
-  SdpMedia() : conn(), dir(DirUndefined), type(MT_NONE), transport(TP_NONE), send(true), recv(true) {}
+  SdpMedia() : port(0), nports(0), conn(), dir(DirUndefined), type(MT_NONE), transport(TP_NONE), send(true), recv(true) {}
 
   /** pretty print */
   string debugPrint() const;