1 files changed, 1 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/development/libraries/science/math/p4est/default.nix b/nixpkgs/pkgs/development/libraries/science/math/p4est/default.nix
index 9396a9144423..a55c5fe573bf 100644
--- a/nixpkgs/pkgs/development/libraries/science/math/p4est/default.nix
+++ b/nixpkgs/pkgs/development/libraries/science/math/p4est/default.nix
@@ -9,7 +9,7 @@
 
 let
   inherit (p4est-sc) debugEnable mpiSupport;
-  dbg = if debugEnable then "-dbg" else "";
+  dbg = lib.optionalString debugEnable "-dbg";
   withMetis = p4est-withMetis;
 in
 stdenv.mkDerivation {