diff --git a/pkgs/development/compilers/llvm/common/lldb.nix b/pkgs/development/compilers/llvm/common/lldb.nix
index 01969b4c5bd5..f4a131c47620 100644
--- a/pkgs/development/compilers/llvm/common/lldb.nix
+++ b/pkgs/development/compilers/llvm/common/lldb.nix
@@ -127,13 +127,13 @@ stdenv.mkDerivation (rec {
 
   # TODO: cleanup with mass-rebuild
   installCheckPhase = ''
-    if [ ! -e $lib/${python3.sitePackages}/lldb/_lldb*.so ] ; then
+    if [ ! -e ''${!outputLib}/${python3.sitePackages}/lldb/_lldb*.so ] ; then
         echo "ERROR: python files not installed where expected!";
         return 1;
     fi
   '' # Something lua is built on older versions but this file doesn't exist.
   + lib.optionalString (lib.versionAtLeast release_version "14") ''
-    if [ ! -e "$lib/lib/lua/${lua5_3.luaversion}/lldb.so" ] ; then
+    if [ ! -e "''${!outputLib}/lib/lua/${lua5_3.luaversion}/lldb.so" ] ; then
         echo "ERROR: lua files not installed where expected!";
         return 1;
     fi