diff --git a/ocaml/runtime/gc_ctrl.c b/ocaml/runtime/gc_ctrl.c
index 746011eefc9..82ba6c93019 100644
--- a/ocaml/runtime/gc_ctrl.c
+++ b/ocaml/runtime/gc_ctrl.c
@@ -302,7 +302,7 @@ CAMLprim value caml_gc_compaction(value v)
   value exn = gc_major_exn(1);
   ++ Caml_state->stat_forced_major_collections;
   CAML_EV_END(EV_EXPLICIT_GC_COMPACT);
-  return caml_raise_if_exception(exn);
+  return caml_raise_async_if_exception(exn, "");
 }
 
 CAMLprim value caml_gc_stat(value v)
diff --git a/ocaml/runtime/sync_posix.h b/ocaml/runtime/sync_posix.h
index 7b8475f6d4e..558f7a94e09 100644
--- a/ocaml/runtime/sync_posix.h
+++ b/ocaml/runtime/sync_posix.h
@@ -92,7 +92,7 @@ Caml_inline int sync_mutex_unlock(sync_mutex m)
 
 /* If we're using glibc, use a custom condition variable implementation to
    avoid this bug: https://sourceware.org/bugzilla/show_bug.cgi?id=25847
-   
+
    For now we only have this on linux because it directly uses the linux futex
    syscalls. */
 #if defined(__linux__) && defined(__GNU_LIBRARY__) && defined(__GLIBC__) && defined(__GLIBC_MINOR__)
@@ -206,7 +206,7 @@ Caml_inline int sync_condvar_wait(sync_condvar c, sync_mutex m)
 
 /* Reporting errors */
 
-static void sync_check_error(int retcode, char * msg)
+Caml_inline void sync_check_error(int retcode, char * msg)
 {
   char * err;
   char buf[1024];