diff --git a/packages/linuxcnc-ethercat/default.nix b/packages/linuxcnc-ethercat/default.nix
index 7ef8a7e..36f78cc 100644
--- a/packages/linuxcnc-ethercat/default.nix
+++ b/packages/linuxcnc-ethercat/default.nix
@@ -1,7 +1,7 @@
 { config, lib, pkgs, stdenv, linuxcnc, etherlab }:
 
 stdenv.mkDerivation rec {
-  enableParalellBuilding = true;
+  enableParallelBuilding = true;
 
   pname = "linuxcnc-ethercat";
   version = "5ad53da25b";
diff --git a/packages/linuxcnc/default.nix b/packages/linuxcnc/default.nix
index d5f286c..810073f 100644
--- a/packages/linuxcnc/default.nix
+++ b/packages/linuxcnc/default.nix
@@ -22,7 +22,7 @@ let
 in
 stdenv.mkDerivation rec {
   hardeningDisable = [ "all" ];
-  enableParalellBuilding = true;
+  enableParallelBuilding = true;
   pname = "linuxcnc";
   version = "2.9-git";
   name = "${pname}-${version}";