diff --git a/Installation/cmake/modules/FindTBB.cmake b/Installation/cmake/modules/FindTBB.cmake
index 38b4ed82e63..8475edd450d 100644
--- a/Installation/cmake/modules/FindTBB.cmake
+++ b/Installation/cmake/modules/FindTBB.cmake
@@ -189,7 +189,7 @@ endmacro()
 #  Now to actually find TBB
 #
 #start with looking for TBB_DIR and TBB_ROOT
-if((TBB_ROOT OR ENV_TBB_ROOT OR ENV{TBB_DIR} ) AND NOT TBB_FOUND)
+if((TBB_ROOT OR ENV{TBB_ROOT} OR ENV{TBB_DIR} ) AND NOT TBB_FOUND)
   find_package(TBB QUIET NO_MODULE NO_CMAKE_SYSTEM_PATH NO_SYSTEM_ENVIRONMENT_PATH)
 endif()
 if(TBB_FOUND)