diff --git a/Tools/ardupilotwaf/cmake.py b/Tools/ardupilotwaf/cmake.py
index 9ec9691c150ae..0616de6128ed6 100644
--- a/Tools/ardupilotwaf/cmake.py
+++ b/Tools/ardupilotwaf/cmake.py
@@ -23,7 +23,7 @@
 the configuration to set a minimum version required for cmake. Example::
 
     def configure(cfg):
-        cfg.CMAKE_MIN_VERSION = '3.5.2'
+        cfg.env.CMAKE_MIN_VERSION = '3.5.2'
         cfg.load('cmake')
 
 Usage example::