diff --git a/pkgs/development/tools/parsing/spicy/default.nix b/pkgs/development/tools/parsing/spicy/default.nix
index 9738ffb41bca..f9ef5f37df24 100644
--- a/pkgs/development/tools/parsing/spicy/default.nix
+++ b/pkgs/development/tools/parsing/spicy/default.nix
@@ -24,13 +24,14 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [
+    bison
     cmake
+    flex
     makeWrapper
     python3
   ];
 
   buildInputs = [
-    bison
     flex
     zlib
   ];