diff --git a/clang/CMakeLists.txt b/clang/CMakeLists.txt
--- a/clang/CMakeLists.txt
+++ b/clang/CMakeLists.txt
@@ -219,7 +219,7 @@
 set(DEFAULT_SYSROOT "" CACHE STRING
   "Default <path> to all compiler invocations for --sysroot=<path>." )
 
-set(ENABLE_LINKER_BUILD_ID OFF CACHE BOOLEAN
+set(ENABLE_LINKER_BUILD_ID OFF CACHE BOOL
   "Pass --build-id or --build-id=<style> to linker (e.g. ld or lld). See also ENABLE_LINKER_BUILD_ID_STYLE.")
 
 set(DEFAULT_LINKER_BUILD_ID_STYLE "" CACHE STRING