diff --git a/pkgs/development/compilers/fpc/default.nix b/pkgs/development/compilers/fpc/default.nix
index d5167b52a700..63a6102a0ece 100644
--- a/pkgs/development/compilers/fpc/default.nix
+++ b/pkgs/development/compilers/fpc/default.nix
@@ -56,6 +56,10 @@ stdenv.mkDerivation rec {
     # substitute the markers set by the mark-paths patch
     substituteInPlace fpcsrc/compiler/systems/t_linux.pas --subst-var-by dynlinker-prefix "${glibc}"
     substituteInPlace fpcsrc/compiler/systems/t_linux.pas --subst-var-by syslibpath "${glibc}/lib"
+
+    substituteInPlace fpcsrc/compiler/systems/t_darwin.pas \
+      --replace-fail "LibrarySearchPath.AddLibraryPath(sysrootpath,'=/usr/lib',true)" "LibrarySearchPath.AddLibraryPath(sysrootpath,'$SDKROOT/usr/lib',true)"
+
     # Replace the `codesign --remove-signature` command with a custom script, since `codesign` is not available
     # in nixpkgs
     # Remove the -no_uuid strip flag which does not work on llvm-strip, only