diff --git a/runtime/caml/printexc.h b/runtime/caml/printexc.h
index 92c5af536..8ae788b13 100644
--- a/runtime/caml/printexc.h
+++ b/runtime/caml/printexc.h
@@ -26,7 +26,9 @@ extern "C" {
 
 
 CAMLextern char * caml_format_exception (value);
+#ifdef CAML_INTERNALS
 CAMLnoreturn_start void caml_fatal_uncaught_exception (value) CAMLnoreturn_end;
+#endif /* CAML_INTERNALS */
 
 #ifdef __cplusplus
 }