diff --git a/overlays/ff-tst-style/default.nix b/overlays/ff-tst-style/default.nix
index 53b42efa..a64ef842 100644
--- a/overlays/ff-tst-style/default.nix
+++ b/overlays/ff-tst-style/default.nix
@@ -9,7 +9,7 @@ final: prev: {
 
     src = ./tst.sass;
 
-    buildInputs = [
+    nativeBuildInputs = [
       sass
     ];
 
diff --git a/overlays/ff-uc-style/default.nix b/overlays/ff-uc-style/default.nix
index 1016ec0f..701bee54 100644
--- a/overlays/ff-uc-style/default.nix
+++ b/overlays/ff-uc-style/default.nix
@@ -9,7 +9,7 @@ final: prev: {
 
     src = ./userChrome.sass;
 
-    buildInputs = [
+    nativeBuildInputs = [
       sass
     ];