diff --git a/cxx4/ncFilter.cpp b/cxx4/ncFilter.cpp
index 95aa01f..a3eace2 100644
--- a/cxx4/ncFilter.cpp
+++ b/cxx4/ncFilter.cpp
@@ -7,20 +7,22 @@
 
 #include "ncFilter.h"
 #include "ncCheck.h"
+#include "netcdf.h"
 
 using namespace std;
 using namespace netCDF;
 
-NcFilter::~NcFilter();
+NcFilter::~NcFilter() {
+
+};
 
 // open a file from path and mode
-void NcFilter::setFilter( unsigned int id, size_t nparams,
-            const unsigned int* parms) const
+void NcFilter::setFilter(unsigned int ncid, unsigned int varid, unsigned int filterId, size_t nparams, const unsigned int* parms)
 {
-  ncCheck(nc_def_var_filter(groupId,myId,id,nparams,parms),__FILE__,__LINE__);
+  ncCheck(nc_def_var_filter(ncid,varid,filterId,nparams,parms),__FILE__,__LINE__);
 }
 
-void NcFilter::getFilter(unsigned int* idp, size_t* nparamsp, unsigned int* params) const
+void NcFilter::getFilter(unsigned int ncid, unsigned int varid, unsigned int* idp, size_t* nparamsp, unsigned int* params)
 {
-  ncCheck(nc_inq_var_filter(groupId, myId, idp, nparamsp, params),__FILE__,__LINE__);
+  ncCheck(nc_inq_var_filter(ncid, varid, idp, nparamsp, params),__FILE__,__LINE__);
 }
diff --git a/cxx4/ncFilter.h b/cxx4/ncFilter.h
index 74073b9..8354c80 100644
--- a/cxx4/ncFilter.h
+++ b/cxx4/ncFilter.h
@@ -10,13 +10,16 @@ namespace netCDF
 {
   class NcFilter
     {
-      //constructor
-      NcFilter ();
       public:
+        ~NcFilter();
+
+        //constructor
+        NcFilter ();
+
         //member function
-        void setFilter();
-        void getFilter();
-    };
+        void setFilter(unsigned int, unsigned int, unsigned int, size_t, const unsigned int*);
+        void getFilter(unsigned int, unsigned int, unsigned int*, size_t*, unsigned int*);
+      };
 
 }
 #endif
diff --git a/cxx4/ncVar.cpp b/cxx4/ncVar.cpp
index 0c2d81c..7216a86 100644
--- a/cxx4/ncVar.cpp
+++ b/cxx4/ncVar.cpp
@@ -627,7 +627,7 @@ void NcVar::getCompressionParameters(bool& shuffleFilterEnabled, bool& deflateFi
 
 ////////////////////
 
-// setting filter details 
+// setting filter details
 //Aodhan adding stuff
 
 ////////////////////