--- a/src/ov.h
+++ b/src/ov.h
@@ -38,6 +38,7 @@
 #include "data-conv.h"
 #include "idx-vector.h"
 #include "mach-info.h"
+#include "mxarray.h"
 #include "mx-base.h"
 #include "oct-alloc.h"
 #include "oct-time.h"
@@ -348,6 +349,8 @@
 
   octave_idx_type nzmax (void) const { return rep->nzmax (); }
 
+  octave_idx_type nfields (void) const { return rep->nfields (); }
+
   octave_value reshape (const dim_vector& dv) const
     { return rep->reshape (dv); }
 
@@ -804,6 +807,16 @@
 
   octave_base_value *internal_rep (void) const { return rep; }
 
+  // Unsafe.  These functions exist to support the MEX interface.
+  // You should not use them anywhere else.
+  void *mex_get_data (void) const { return rep->mex_get_data (); }
+
+  octave_idx_type *mex_get_ir (void) const { return rep->mex_get_ir (); }
+
+  octave_idx_type *mex_get_jc (void) const { return rep->mex_get_jc (); }
+
+  mxArray *as_mxArray (void) const { return rep->as_mxArray (); }
+
 protected:
 
   // The real representation.