1 files changed, 1 insertions, 0 deletions
diff --git a/complex.c b/complex.c
index d625ced7fa..865466c499 100644
--- a/complex.c
+++ b/complex.c
@@ -2335,6 +2335,7 @@ Init_Complex(void)
     rb_undef_method(rb_cComplex, "%");
     rb_undef_method(rb_cComplex, "div");
     rb_undef_method(rb_cComplex, "divmod");
+    rb_undef_method(rb_cComplex, "ceildiv");
     rb_undef_method(rb_cComplex, "floor");
     rb_undef_method(rb_cComplex, "ceil");
     rb_undef_method(rb_cComplex, "modulo");