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-rw-r--r--pkgs/tools/filesystems/moosefs/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/tools/filesystems/moosefs/default.nix b/pkgs/tools/filesystems/moosefs/default.nix
index e07ca270b5c8e..dc1d77bfa7ed4 100644
--- a/pkgs/tools/filesystems/moosefs/default.nix
+++ b/pkgs/tools/filesystems/moosefs/default.nix
@@ -35,7 +35,7 @@ stdenv.mkDerivation rec {
       "/usr/local/lib/pkgconfig" "/nonexistent"
   '';
 
-  preBuild = lib.optional stdenv.isDarwin ''
+  preBuild = lib.optionalString stdenv.isDarwin ''
     substituteInPlace config.h --replace \
       "#define HAVE_STRUCT_STAT_ST_BIRTHTIME 1" \
       "#undef HAVE_STRUCT_STAT_ST_BIRTHTIME"