1 files changed, 1 insertions, 1 deletions
diff --git a/vm.c b/vm.c
index 7f7ae3a6d6..0077522317 100644
--- a/vm.c
+++ b/vm.c
@@ -4031,7 +4031,7 @@ Init_vm_objects(void)
     vm->loading_table = st_init_strtable();
     vm->frozen_strings = st_init_table_with_size(&rb_fstring_hash_type, 10000);
 
-#if HAVE_MMAP
+#ifdef HAVE_MMAP
     vm->shape_list = (rb_shape_t *)mmap(NULL, rb_size_mul_or_raise(SHAPE_BITMAP_SIZE * 32, sizeof(rb_shape_t), rb_eRuntimeError),
                          PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
     if (vm->shape_list == MAP_FAILED) {