diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1bacca1a48..11f931ad39 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -820,6 +820,8 @@ else()
   OCCT_CHECK_AND_UNSET ("3RDPARTY_DOT_EXECUTABLE")
 endif()
 
+list (REMOVE_ITEM BUILD_TOOLKITS ExpToCasExe)
+
 # bison
 if (BUILD_YACCLEX)
   OCCT_INCLUDE_CMAKE_FILE ("adm/cmake/bison")