diff --git a/compiler/options.pas b/compiler/options.pas
index a183366d98..258695620e 100644
--- a/compiler/options.pas
+++ b/compiler/options.pas
@@ -3576,7 +3576,7 @@ if (target_info.abi = abi_eabihf) then
 {$endif ARM}
 
 { inline bsf/bsr implementation }
-{$if defined(i386) or defined(x86_64)}
+{$if not defined(llvm) and (defined(i386) or defined(x86_64))}
   def_system_macro('FPC_HAS_INTERNAL_BSF');
   def_system_macro('FPC_HAS_INTERNAL_BSR');
 {$endif}