diff --git a/mm/ksm.c b/mm/ksm.c
index 707be52..e14448a 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -562,6 +562,7 @@ static pte_t *get_pte(struct mm_struct *mm, unsigned long addr)
 		goto out;
 
 	ptep = pte_offset_map(pmd, addr);
+	pte_unmap(ptep);
 out:
 	return ptep;
 }