diff --git a/pkgs/development/ocaml-modules/ocamlformat/generic.nix b/pkgs/development/ocaml-modules/ocamlformat/generic.nix
index 9c1bfa77cf26..164f54e452a3 100644
--- a/pkgs/development/ocaml-modules/ocamlformat/generic.nix
+++ b/pkgs/development/ocaml-modules/ocamlformat/generic.nix
@@ -21,7 +21,6 @@
   stdio,
   uuseg,
   uutf,
-  janeStreet_0_15,
   ...
 }:
 
@@ -67,13 +66,9 @@ rec {
 
   cmdliner_v = if lib.versionAtLeast version "0.21.0" then cmdliner_1_1 else cmdliner_1_0;
 
-  base_v = if lib.versionAtLeast version "0.25.1" then base else janeStreet_0_15.base;
-
-  stdio_v = if lib.versionAtLeast version "0.25.1" then stdio else janeStreet_0_15.stdio;
-
   library_deps =
     [
-      base_v
+      base
       cmdliner_v
       dune-build-info
       fix
@@ -81,7 +76,7 @@ rec {
       menhirLib
       menhirSdk
       ocp-indent
-      stdio_v
+      stdio
       uuseg
       uutf
     ]
diff --git a/pkgs/development/ocaml-modules/ocamlformat/ocamlformat.nix b/pkgs/development/ocaml-modules/ocamlformat/ocamlformat.nix
index dc2671a265f0..3dc8e2ab4e33 100644
--- a/pkgs/development/ocaml-modules/ocamlformat/ocamlformat.nix
+++ b/pkgs/development/ocaml-modules/ocamlformat/ocamlformat.nix
@@ -17,6 +17,7 @@ in
 lib.throwIf
   (
     lib.versionAtLeast ocaml.version "5.0" && !lib.versionAtLeast version "0.23"
+    || lib.versionAtLeast ocaml.version "5.1" && !lib.versionAtLeast version "0.25"
     || lib.versionAtLeast ocaml.version "5.2" && !lib.versionAtLeast version "0.26.2"
     || lib.versionAtLeast ocaml.version "5.3" && !lib.versionAtLeast version "0.27"
   )