Index: /issm/trunk-jpl/m4/issm_options.m4
===================================================================
--- /issm/trunk-jpl/m4/issm_options.m4	(revision 18641)
+++ /issm/trunk-jpl/m4/issm_options.m4	(revision 18642)
@@ -264,10 +264,12 @@
   					MEXLIB="-Wl,./../../c/libISSMCore.a -Wl,libISSMApi.a -Wl,libISSMMatlab.a -Wl,./../../c/libISSMModules.a -Wl,libmx.lib -Wl,libmex.lib -Wl,libmat.lib ${OSLIBS} -Wl,libf2cblas.lib -Wl,libf2clapack.lib" 
                MEXLINK="-Wl,/LIBPATH:`cygpath -m ${MATLAB_ROOT}/extern/lib/win32/microsoft` -no-undefined -Wl,/export:mexFunction" 
+					MEXEXT=`$MATLAB_ROOT/bin/mexext.bat`
+					MEXEXT=".$MEXEXT"
   				elif  test l-win7-64; then
   					MEXLIB="-Wl,./../../c/libISSMCore.a -Wl,libISSMApi.a -Wl,libISSMMatlab.a -Wl,./../../c/libISSMModules.a -Wl,libmx.lib -Wl,libmex.lib -Wl,libmat.lib ${OSLIBS} -Wl,libf2cblas.lib -Wl,libf2clapack.lib" 
                MEXLINK="-Wl,/LIBPATH:`cygpath -m ${MATLAB_ROOT}/extern/lib/win64/microsoft` -no-undefined -Wl,/export:mexFunction" 
+					MEXEXT=".mexw64"
   				fi
-  				MEXEXT=`$MATLAB_ROOT/bin/mexext.bat`
-  				MEXEXT=".$MEXEXT"
+
   			;;
 		   *)