diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 3065dcb8069..1b07bd0db03 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -9668,11 +9668,11 @@ in
   # So this commit doesn't remove the 1.45.2 release.
   rust_1_45 = callPackage ../development/compilers/rust/1_45.nix {
     inherit (darwin.apple_sdk.frameworks) CoreFoundation Security;
-    llvmPackages = llvmPackages_10;
+    llvmPackages = if stdenv.cc.isClang then llvmPackages_5 else llvmPackages_10;
   };
   rust_1_46 = callPackage ../development/compilers/rust/1_46.nix {
     inherit (darwin.apple_sdk.frameworks) CoreFoundation Security;
-    llvmPackages = llvmPackages_10;
+    llvmPackages = if stdenv.cc.isClang then llvmPackages_5 else llvmPackages_10;
   };
   rust = rust_1_46;