diff --git a/nls.c b/nls.c
index 675d0e7058c5..58e434a5c330 100644
--- a/nls.c
+++ b/nls.c
@@ -3,9 +3,13 @@
  * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
  */
 
+#include <linux/version.h>
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/buffer_head.h>
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 18, 0)
+#include <linux/vmalloc.h>
+#endif
 #include <asm/unaligned.h>
 
 #include "exfat_raw.h"
@@ -659,7 +663,11 @@ static int exfat_load_upcase_table(struct super_block *sb,
 	unsigned char skip = false;
 	unsigned short *upcase_table;
 
-	upcase_table = kcalloc(UTBL_COUNT, sizeof(unsigned short), GFP_KERNEL);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18, 0)
+	upcase_table = kvcalloc(UTBL_COUNT, sizeof(unsigned short), GFP_KERNEL);
+#else
+	upcase_table = vzalloc(UTBL_COUNT * sizeof(unsigned short));
+#endif
 	if (!upcase_table)
 		return -ENOMEM;
 
@@ -715,7 +723,11 @@ static int exfat_load_default_upcase_table(struct super_block *sb)
 	unsigned short uni = 0, *upcase_table;
 	unsigned int index = 0;
 
-	upcase_table = kcalloc(UTBL_COUNT, sizeof(unsigned short), GFP_KERNEL);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18, 0)
+	upcase_table = kvcalloc(UTBL_COUNT, sizeof(unsigned short), GFP_KERNEL);
+#else
+	upcase_table = vzalloc(UTBL_COUNT * sizeof(unsigned short));
+#endif
 	if (!upcase_table)
 		return -ENOMEM;
 
@@ -803,5 +815,9 @@ int exfat_create_upcase_table(struct super_block *sb)
 
 void exfat_free_upcase_table(struct exfat_sb_info *sbi)
 {
-	kfree(sbi->vol_utbl);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18, 0)
+	kvfree(sbi->vol_utbl);
+#else
+	vfree(sbi->vol_utbl);
+#endif
 }