diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 959bfd90d2f..8240bb15731 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -703,23 +703,6 @@ mapAliases ({
   # added 2020-02-09
   dina-font-pcf = dina-font;
 
-    /* Cleanup before 20.09 */
-  llvm_4 = throw ''
-    The LLVM versions 3.5, 3.9 and 4.0 have been removed in NixOS 20.03
-    due to a lack of compatibility with glibc 2.30!
-  '';
-  llvm_39 = llvm_4;
-  llvm_35 = llvm_4;
-  lld_4 = llvm_4;
-
-  llvmPackages_4 = llvm_4;
-  llvmPackages_39 = llvm_4;
-  llvmPackages_35 = llvm_4;
-
-  clang_39 = llvm_4;
-  clang_35 = llvm_4;
-  clang_4 = llvm_4;
-
   # added 2019-04-13
   # *-polly pointed to llvmPackages_latest
   llvm-polly = throw "clang is now built with polly-plugin by default";