diff --git a/sys/compat/linuxkpi/common/include/linux/mm_types.h b/sys/compat/linuxkpi/common/include/linux/mm_types.h
index 5529c0afe0d8..4c9eddf500d6 100644
--- a/sys/compat/linuxkpi/common/include/linux/mm_types.h
+++ b/sys/compat/linuxkpi/common/include/linux/mm_types.h
@@ -57,6 +57,12 @@ mmdrop(struct mm_struct *mm)
 		linux_mm_dtor(mm);
 }
 
+static inline bool
+mmget_not_zero(struct mm_struct *mm)
+{
+	return (atomic_inc_not_zero(&mm->mm_users));
+}
+
 static inline void
 mmput(struct mm_struct *mm)
 {