diff --git a/CMakeLists.txt b/CMakeLists.txt
index c32c281..aa1b049 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -75,7 +75,7 @@ endif()
   endif()
 
 if(NOT DEFINED CUB_DIR AND DEFINED ENV{CUB_DIR})
-  set(CUB_DIR ENV{CUB_DIR})
+  set(CUB_DIR $ENV{CUB_DIR})
 endif()
 
 message(STATUS "Finding CUB")