1 files changed, 2 insertions, 2 deletions
diff --git a/ractor.c b/ractor.c
index 484b5c78b9..585435c820 100644
--- a/ractor.c
+++ b/ractor.c
@@ -2445,10 +2445,10 @@ rb_ractor_make_shareable_copy(VALUE obj)
 VALUE
 rb_ractor_ensure_shareable(VALUE obj, VALUE name)
 {
-    if (!RTEST(rb_ractor_shareable_p(obj))) {
+    if (!rb_ractor_shareable_p(obj)) {
         VALUE message = rb_sprintf("cannot assign unshareable object to %"PRIsVALUE,
                                    name);
-        rb_exc_raise(rb_exc_new_str(rb_eRactorError, message));
+        rb_exc_raise(rb_exc_new_str(rb_eRactorIsolationError, message));
     }
     return obj;
 }