diff --git a/pkgs/development/compilers/ocaml/4.09.nix b/pkgs/development/compilers/ocaml/4.09.nix
index 4b56d82eba5..a093a244641 100644
--- a/pkgs/development/compilers/ocaml/4.09.nix
+++ b/pkgs/development/compilers/ocaml/4.09.nix
@@ -1,6 +1,9 @@
 import ./generic.nix {
   major_version = "4";
   minor_version = "09";
-  patch_version = "0";
-  sha256 = "1v3z5ar326f3hzvpfljg4xj8b9lmbrl53fn57yih1bkbx3gr3yzj";
+  patch_version = "1";
+  sha256 = "1aq5505lpa39garky2icgfv4c7ylpx3j623cz9bsz5c466d2kqls";
+
+  # Breaks build with Clang
+  hardeningDisable = [ "strictoverflow" ];
 }