diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 95a19240a0a8..31f898fb9228 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -4730,7 +4730,7 @@ with pkgs;
 
   clang = llvmPackages.clang;
 
-  clang_40 = llvmPackages_40.clang;
+  clang_40 = lowPrio llvmPackages_40.clang;
   clang_39 = llvmPackages_39.clang;
   clang_38 = llvmPackages_38.clang;
   clang_37 = llvmPackages_37.clang;
@@ -5278,13 +5278,13 @@ with pkgs;
 
   lizardfs = callPackage ../tools/filesystems/lizardfs { };
 
-  lld = llvmPackages_40.lld;
+  lld = lowPrio llvmPackages_40.lld;
 
   lldb = llvmPackages.lldb;
 
   llvm = llvmPackages.llvm;
 
-  llvm_40 = llvmPackages_40.llvm;
+  llvm_40 = lowPrio llvmPackages_40.llvm;
   llvm_39 = llvmPackages_39.llvm;
   llvm_38 = llvmPackages_38.llvm;
   llvm_37 = llvmPackages_37.llvm;