diff --git a/pkgs/development/compilers/ghc/9.0.1.nix b/pkgs/development/compilers/ghc/9.0.1.nix
index 54b256c28c1..859d288649d 100644
--- a/pkgs/development/compilers/ghc/9.0.1.nix
+++ b/pkgs/development/compilers/ghc/9.0.1.nix
@@ -185,7 +185,7 @@ stdenv.mkDerivation (rec {
   strictDeps = true;
 
   # Don’t add -liconv to LDFLAGS automatically so that GHC will add it itself.
-	dontAddExtraLibs = true;
+  dontAddExtraLibs = true;
 
   nativeBuildInputs = [
     perl autoconf automake m4 python3 sphinx