diff --git a/ext/opencv/MotionCells.cpp b/ext/opencv/MotionCells.cpp
index 7db9896e51..5223bc7f73 100644
--- a/ext/opencv/MotionCells.cpp
+++ b/ext/opencv/MotionCells.cpp
@@ -95,6 +95,8 @@ MotionCells::MotionCells ()
   m_saveerrorcode = 0;
   m_alpha = 0.5;
   m_beta = 0.5;
+  m_useAlpha = false;
+  m_isVisible = false;
 
 }