Index: /issm/trunk-jpl/m4/issm_options.m4
===================================================================
--- /issm/trunk-jpl/m4/issm_options.m4	(revision 19110)
+++ /issm/trunk-jpl/m4/issm_options.m4	(revision 19111)
@@ -275,15 +275,16 @@
 					MEXEXT=`$MATLAB_ROOT/bin/mexext.bat`
 					MEXEXT=".$MEXEXT"
+					IS_WINDOWS=yes
   				elif test $VENDOR = intel-win7-64; then
   					MEXLIB="-Wl,libmx.lib -Wl,libmex.lib -Wl,libmat.lib ${OSLIBS} -Wl,libf2cblas.lib -Wl,libf2clapack.lib" 
                MEXLINK="-Wl,/LIBPATH:`cygpath -m ${MATLAB_DIR}/extern/lib/win64/microsoft` -Wl,/export:mexFunction -Wl,/LD" 
 					MEXEXT=".mexw64"
+					IS_WINDOWS=yes
   				elif test $VENDOR = MSVC-Win64; then
   					MEXLIB="-Wl,libmx.lib -Wl,libmex.lib -Wl,libmat.lib ${OSLIBS} -Wl,libf2cblas.lib -Wl,libf2clapack.lib" 
                MEXLINK="-Wl,/LIBPATH:`cygpath -m ${MATLAB_DIR}/extern/lib/win64/microsoft` -Wl,/export:mexFunction -Wl,/LD" 
 					MEXEXT=".mexw64"
+					IS_WINDOWS=yes
   				fi
-				IS_WINDOWS=yes
-
   			;;
 		   *)