diff --git a/gcc/analyzer/kf.cc b/gcc/analyzer/kf.cc
index b3c02e843090..c9818de60dc4 100644
--- a/gcc/analyzer/kf.cc
+++ b/gcc/analyzer/kf.cc
@@ -2334,9 +2334,6 @@ register_known_functions (known_function_manager &kfm,
     kfm.add ("__builtin_strlen", std::make_unique<kf_strlen> ());
     kfm.add ("strstr", std::make_unique<kf_strstr> ());
     kfm.add ("__builtin_strstr", std::make_unique<kf_strstr> ());
-
-    register_atomic_builtins (kfm);
-    register_varargs_builtins (kfm);
   }
 
   /* Known POSIX functions, and some non-standard extensions.  */