diff --git a/gc.c b/gc.c
index 04df9dc71b..2b363ac7d0 100644
--- a/gc.c
+++ b/gc.c
@@ -1910,6 +1910,11 @@ rb_objspace_alloc(void)
 
     rb_darray_make_without_gc(&objspace->weak_references, 0);
 
+    // TODO: debug why on Windows Ruby crashes on boot when GC is on.
+#ifdef _WIN32
+    dont_gc_on();
+#endif
+
     return objspace;
 }
 
diff --git a/vm.c b/vm.c
index c9d99a34ea..36f6700ad7 100644
--- a/vm.c
+++ b/vm.c
@@ -4198,7 +4198,9 @@ Init_VM(void)
          */
         rb_define_global_const("TOPLEVEL_BINDING", rb_binding_new());
 
+#ifdef _WIN32
         rb_objspace_gc_enable(vm->objspace);
+#endif
     }
     vm_init_redefined_flag();