1 files changed, 1 insertions, 1 deletions
diff --git a/complex.c b/complex.c
index 8420c190eb..14869e0d05 100644
--- a/complex.c
+++ b/complex.c
@@ -313,7 +313,7 @@ k_complex_p(VALUE x)
 inline static VALUE
 nucomp_s_new_internal(VALUE klass, VALUE real, VALUE imag)
 {
-    NEWOBJ_OF(obj, struct RComplex, klass, T_COMPLEX);
+    NEWOBJ_OF(obj, struct RComplex, klass, T_COMPLEX | (RGENGC_WB_PROTECTED_COMPLEX ? FL_WB_PROTECTED : 0));
 
     RCOMPLEX_SET_REAL(obj, real);
     RCOMPLEX_SET_IMAG(obj, imag);