diff --git a/CMakeLists.txt b/CMakeLists.txt
index b2eb694bf..4b4db2440 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -723,7 +723,7 @@ add_custom_target(uninstall
 
 
 # Modular build system: each directory registered here provides its own CMakeLists.txt
-if (not MSVC)
+if (NOT MSVC)
   add_subdirectory(unit_tests)
   add_subdirectory(src/benchmarks)
 endif()