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-rw-r--r--pkgs/development/ocaml-modules/bitstring/ppx.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/ocaml-modules/bitstring/ppx.nix b/pkgs/development/ocaml-modules/bitstring/ppx.nix
index 4d391d3458d..9eb4c74f574 100644
--- a/pkgs/development/ocaml-modules/bitstring/ppx.nix
+++ b/pkgs/development/ocaml-modules/bitstring/ppx.nix
@@ -3,7 +3,7 @@
 , ounit
 }:
 
-if !lib.versionAtLeast ppxlib.version "0.18.0"
+if lib.versionOlder ppxlib.version "0.18.0"
 then throw "ppx_bitstring is not available with ppxlib-${ppxlib.version}"
 else