diff --git a/cmake/FindOptiX.cmake b/cmake/FindOptiX.cmake
index 40e25ac..386ef4a 100644
--- a/cmake/FindOptiX.cmake
+++ b/cmake/FindOptiX.cmake
@@ -22,16 +22,16 @@ if(DEFINED ENV{OPTIX_INCLUDE_DIR})
 
   # INCLUDE
   find_path(OptiX_INCLUDE_DIR
-  NAMES optix.h
-  PATHS "${OptiX_INCLUDE_DIR_ENV}"
-  NO_DEFAULT_PATH
+    NAMES optix.h
+    PATHS "${OptiX_INCLUDE_DIR_ENV}"
+    NO_DEFAULT_PATH
   )
 
   if(NOT OptiX_INCLUDE_DIR)
   message(WARNING "Environment variable 'OptiX_INCLUDE_DIR' pointing to optix headers folder that is not conform. Make sure it does contain the 'optix.h' file.")
   endif(NOT OptiX_INCLUDE_DIR)
 
-endif(DEFINED ENV{OptiX_INCLUDE_DIR})
+endif(DEFINED ENV{OPTIX_INCLUDE_DIR})
 
 # INCLUDE
 find_path(OptiX_INCLUDE_DIR