diff --git a/pkgs/development/tools/ocaml/camlp5/default.nix b/pkgs/development/tools/ocaml/camlp5/default.nix
index 4a8cd807a53f..e2931d73ddc3 100644
--- a/pkgs/development/tools/ocaml/camlp5/default.nix
+++ b/pkgs/development/tools/ocaml/camlp5/default.nix
@@ -8,6 +8,7 @@
   makeWrapper,
   rresult,
   bos,
+  fmt,
   pcre2,
   re,
   camlp-streams,
@@ -52,12 +53,15 @@ stdenv.mkDerivation (
 
     buildInputs = lib.optionals recent [
       bos
-      pcre2
       re
       rresult
     ];
 
-    propagatedBuildInputs = lib.optional recent camlp-streams;
+    propagatedBuildInputs = lib.optionals recent [
+      camlp-streams
+      pcre2
+      fmt
+    ];
 
     strictDeps = true;