diff --git a/pkgs/development/compilers/llvm/common/libc/default.nix b/pkgs/development/compilers/llvm/common/libc/default.nix
index f57239b7a978..2ba098da2814 100644
--- a/pkgs/development/compilers/llvm/common/libc/default.nix
+++ b/pkgs/development/compilers/llvm/common/libc/default.nix
@@ -60,7 +60,7 @@ stdenv.mkDerivation (finalAttrs: {
   '';
 
   postInstall = lib.optionalString (!isFullBuild) ''
-    substituteAll ${./libc-shim.so} $out/lib/libc.so
+    substituteAll ${./libc-shim.tpl} $out/lib/libc.so
   '';
 
   libc = if (!isFullBuild) then stdenv.cc.libc else null;
diff --git a/pkgs/development/compilers/llvm/common/libc/libc-shim.so b/pkgs/development/compilers/llvm/common/libc/libc-shim.tpl
similarity index 100%
rename from pkgs/development/compilers/llvm/common/libc/libc-shim.so
rename to pkgs/development/compilers/llvm/common/libc/libc-shim.tpl