--- a/libguile/vm.c
+++ b/libguile/vm.c
@@ -884,7 +884,7 @@
 static void
 return_unused_stack_to_os (struct scm_vm *vp)
 {
-#if HAVE_SYS_MMAN_H
+#if HAVE_SYS_MMAN_H && !defined(__MINGW32__)
   scm_t_uintptr lo = (scm_t_uintptr) vp->stack_bottom;
   scm_t_uintptr hi = (scm_t_uintptr) vp->sp;
   /* The second condition is needed to protect against wrap-around.  */