diff --git a/tools/dune b/tools/dune
index 120fb651..5139e6a5 100644
--- a/tools/dune
+++ b/tools/dune
@@ -5,7 +5,10 @@
 
 (executable
  (name gencopy)
- (enabled_if (>= %{ocaml_version} 4.13))
+ (enabled_if
+  (and
+   (>= %{ocaml_version} 4.13)
+   (< %{ocaml_version} 4.14)))
  (modules gencopy)
  (libraries compiler-libs.common compiler-libs.bytecomp)
  (flags :standard -w -3))