diff --git a/CMakeLists.txt b/CMakeLists.txt
index 536145d5..ceb48994 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,7 +16,7 @@ include(GNUInstallDirs)
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
-SET(CMAKE_BUILD_TYPE "${CMAKE_BUILD_TYPE}" CACHE STRING
+set(CMAKE_BUILD_TYPE "${CMAKE_BUILD_TYPE}" CACHE STRING
     "Build type: None, Debug, Release, RelWithDebInfo, MinSizeRel, or Sanitizer." FORCE)
 
 if (NOT EXISTS ${CMAKE_BINARY_DIR}/CMakeCache.txt AND NOT CMAKE_BUILD_TYPE)