1 files changed, 1 insertions, 1 deletions
diff --git a/bignum.c b/bignum.c
index 7e5ce4d585..ee481e1bd7 100644
--- a/bignum.c
+++ b/bignum.c
@@ -7097,7 +7097,7 @@ rb_int_powm(int const argc, VALUE * const argv, VALUE const num)
             return int_pow_tmp3(rb_int_modulo(a, m), b, m, nega_flg);
         }
     }
-    UNREACHABLE;
+    UNREACHABLE_RETURN(Qnil);
 }
 
 /*