diff --git a/pkgs/development/compilers/ocaml/generic.nix b/pkgs/development/compilers/ocaml/generic.nix
index 1fa52721ddb9..c2cc7bb40b5f 100644
--- a/pkgs/development/compilers/ocaml/generic.nix
+++ b/pkgs/development/compilers/ocaml/generic.nix
@@ -17,7 +17,7 @@ in
 assert useX11 -> safeX11 stdenv;
 assert aflSupport -> lib.versionAtLeast version "4.05";
 assert flambdaSupport -> lib.versionAtLeast version "4.03";
-assert spaceTimeSupport -> lib.versionAtLeast version "4.04";
+assert spaceTimeSupport -> lib.versionAtLeast version "4.04" && lib.versionOlder version "4.12";
 assert unsafeStringSupport -> lib.versionAtLeast version "4.06" && lib.versionOlder version "5.0";
 
 let