diff --git a/pkgs/development/compilers/fpc/lazarus.nix b/pkgs/development/compilers/fpc/lazarus.nix
index 5cd0609960d..5ddaa7c429f 100644
--- a/pkgs/development/compilers/fpc/lazarus.nix
+++ b/pkgs/development/compilers/fpc/lazarus.nix
@@ -45,6 +45,10 @@ stdenv.mkDerivation rec {
   ]
   ++ lib.optionals withQt [ libqt5pas qtbase ];
 
+  # Disable parallel build, errors:
+  #  Fatal: (1018) Compilation aborted
+  enableParallelBuilding = false;
+
   nativeBuildInputs = [
     makeWrapper
   ] ++ lib.optional withQt wrapQtAppsHook;