diff --git a/SuperBuild/CMake/External_ossim.cmake b/SuperBuild/CMake/External_ossim.cmake
index e6d16d100c2601f5dcf256466d63a8a16fb303cd..0eeadf596dfc93f745640f85decb1691ad2b36d7 100644
--- a/SuperBuild/CMake/External_ossim.cmake
+++ b/SuperBuild/CMake/External_ossim.cmake
@@ -42,6 +42,7 @@ else()
 
   if(MSVC)
     set(OSSIM_CXX_FLAGS /EHsc)
+    list(APPEND OSSIM_SB_CONFIG "-GNMake\ Makefiles")
   endif()
 
   # archive version