diff --git a/source/Lib/CommonLib/Picture.h b/source/Lib/CommonLib/Picture.h
index 6447a0a0a529f1a5f2c34ab4f3b8222f652b8d4a..eb5ef94e3ab45435af39674e5643e69a47588dc4 100644
--- a/source/Lib/CommonLib/Picture.h
+++ b/source/Lib/CommonLib/Picture.h
@@ -203,7 +203,7 @@ public:
   PelStorage m_bufSubPicBelow;
   PelStorage m_bufSubPicLeft;
   PelStorage m_bufSubPicRight;
-  int m_numSubPic;
+  int m_numSubPic = 1;
 
   PelStorage m_bufWrapSubPicAbove;
   PelStorage m_bufWrapSubPicBelow;