diff --git a/CMakeLists.txt b/CMakeLists.txt
index c6916a7472..b6d58c6af5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,7 +25,7 @@ set(CMAKE_CXX_EXTENSIONS OFF)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 if(NOT CMAKE_CXX_STANDARD)
-set(CMAKE_CXX_STANDARD 17 CACHE STRING "The C++ standard to use")
+  set(CMAKE_CXX_STANDARD 17 CACHE STRING "The C++ standard to use")
 endif()
 message(STATUS "CMAKE_CXX_STANDARD: ${CMAKE_CXX_STANDARD}")