diff --git a/platforms/avr/toolchain.cmake b/platforms/avr/toolchain.cmake
index a685334b055..9a6e31b70ee 100644
--- a/platforms/avr/toolchain.cmake
+++ b/platforms/avr/toolchain.cmake
@@ -38,7 +38,7 @@ elseif(WIN32)
             $ENV{AVR_ROOT}
     )
     set(OS_SUFFIX ".exe")
-    find_path(make_ROOT
+    find_path(MAKE_ROOT
         NAMES
             make${OS_SUFFIX}
         PATHS