diff --git a/kernel/fork.c b/kernel/fork.c
index 6af959c..ffccefb 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -286,6 +286,8 @@
 		if (retval)
 			goto out;
 	}
+	/* a new mm has just been created */
+	arch_dup_mmap(oldmm, mm);
 	retval = 0;
 out:
 	up_write(&mm->mmap_sem);