diff --git a/pkgs/development/tools/ocaml/ocp-index/default.nix b/pkgs/development/tools/ocaml/ocp-index/default.nix
index c901d676b90e..76be5f8bd47d 100644
--- a/pkgs/development/tools/ocaml/ocp-index/default.nix
+++ b/pkgs/development/tools/ocaml/ocp-index/default.nix
@@ -2,7 +2,7 @@
 
 let inherit (stdenv.lib) getVersion versionAtLeast optional; in
 
-assert versionAtLeast (getVersion ocaml) "3.12.1";
+assert versionAtLeast (getVersion ocaml) "4";
 assert versionAtLeast (getVersion ocpBuild) "1.99.6-beta";
 assert versionAtLeast (getVersion ocpIndent) "1.4.2";