diff --git a/src/ctbin/ctbin.cpp b/src/ctbin/ctbin.cpp
index dfb5c3a..348b567 100755
--- a/src/ctbin/ctbin.cpp
+++ b/src/ctbin/ctbin.cpp
@@ -404,6 +404,7 @@ void ctbin::init_members(void)
     // Initialise members
     m_outcube.clear();
     m_usepnt  = false;
+    m_stack   = true;
     m_publish = false;
     m_chatter = static_cast<GChatter>(2);
 
@@ -434,6 +435,7 @@ void ctbin::copy_members(const ctbin& app)
     // Copy attributes
     m_outcube = app.m_outcube;
     m_usepnt  = app.m_usepnt;
+    m_stack   = app.m_stack;
     m_publish = app.m_publish;
     m_chatter = app.m_chatter;
 
@@ -491,6 +493,9 @@ void ctbin::get_parameters(void)
     // Get energy boundaries
     m_ebounds = cube.ebounds();
 
+    // Get stack parameter
+    m_stack = (*this)["stack"].boolean();
+
     // Get remaining parameters
     m_publish = (*this)["publish"].boolean();
     m_chatter = static_cast<GChatter>((*this)["chatter"].integer());
diff --git a/src/ctbin/ctbin.hpp b/src/ctbin/ctbin.hpp
index 21cd9ab..7935172 100755
--- a/src/ctbin/ctbin.hpp
+++ b/src/ctbin/ctbin.hpp
@@ -91,6 +91,7 @@ protected:
     // User parameters
     GFilename     m_outcube;  //!< Output counts map file name
     bool          m_usepnt;   //!< Use pointing instead of xref/yref parameters
+    bool          m_stack;    //!< Output one stacked cube or multiple cubes
     bool          m_publish;  //!< Publish counts cube?
     GChatter      m_chatter;  //!< Chattiness
 
diff --git a/src/ctbin/ctbin.par b/src/ctbin/ctbin.par
index 2a6c521..e801c94 100755
--- a/src/ctbin/ctbin.par
+++ b/src/ctbin/ctbin.par
@@ -18,6 +18,7 @@
 #===================
 inobs,   f, a, events.fits,,, "Input event list or observation definition XML file"
 outcube, f, a, cntcube.fits,,, "Output counts cube file"
+stack,   b, h, yes,,, "Stack events to one cube?"
 
 #
 # Energy binning parameters