diff --git a/CMakeLists.txt b/CMakeLists.txt
index f65efef..6adbf45 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -141,30 +141,30 @@ write_basic_package_version_file(
 configure_file(yaml-cpp.pc.in yaml-cpp.pc @ONLY)
 
 if (YAML_CPP_INSTALL)
-	install(TARGETS yaml-cpp
+  install(TARGETS yaml-cpp
     EXPORT yaml-cpp-targets
     RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
     LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
     ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
-	install(DIRECTORY ${PROJECT_SOURCE_DIR}/include/
+  install(DIRECTORY ${PROJECT_SOURCE_DIR}/include/
     DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
-		FILES_MATCHING PATTERN "*.h")
+                FILES_MATCHING PATTERN "*.h")
   install(EXPORT yaml-cpp-targets
     DESTINATION "${CMAKE_INSTALL_DATADIR}/cmake/yaml-cpp")
-	install(FILES
-		"${PROJECT_BINARY_DIR}/yaml-cpp-config.cmake"
-		"${PROJECT_BINARY_DIR}/yaml-cpp-config-version.cmake"
+  install(FILES
+                "${PROJECT_BINARY_DIR}/yaml-cpp-config.cmake"
+                "${PROJECT_BINARY_DIR}/yaml-cpp-config-version.cmake"
     DESTINATION "${CMAKE_INSTALL_DATADIR}/cmake/yaml-cpp")
   install(FILES "${PROJECT_BINARY_DIR}/yaml-cpp.pc"
     DESTINATION ${CMAKE_INSTALL_DATADIR}/pkgconfig)
 endif()
 
 if(YAML_CPP_BUILD_TESTS)
-	add_subdirectory(test)
+  add_subdirectory(test)
 endif()
 
 if(YAML_CPP_BUILD_TOOLS)
-	add_subdirectory(util)
+  add_subdirectory(util)
 endif()
 
 if (YAML_CPP_CLANG_FORMAT_EXE)