diff --git a/CMakeLists.txt b/CMakeLists.txt
index acca545a60f12878a8c8d00e52af8117abf7d949..bc8b5d48c6e4e931c52dfebe8a81c1f76e196b05 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -587,8 +587,13 @@ if(ENABLE_OCC)
       if(CYGWIN)
         list(APPEND EXTERNAL_LIBRARIES "winspool")
       elseif(MSVC)
-        add_definitions(-DHAVE_NO_OCC_CONFIG_H -DWNT)
+        add_definitions(-DWNT)
       endif(CYGWIN)
+      find_path(OCC_CONFIG_H "config.h" PATHS ENV CASROOT PATH_SUFFIXES inc 
+                include opencascade NO_DEFAULT_PATH)
+      if(NOT OCC_CONFIG_H)
+        add_definitions(-DHAVE_NO_OCC_CONFIG_H)
+      endif(NOT OCC_CONFIG_H)
     endif(OCC_INC)
   endif(NUM_OCC_LIBS EQUAL NUM_OCC_LIBS_REQUIRED)
 endif(ENABLE_OCC)