diff --git a/fs/ext4/dev.c b/fs/ext4/dev.c
index fb62f24..9e85228 100644
--- a/fs/ext4/dev.c
+++ b/fs/ext4/dev.c
@@ -62,7 +62,7 @@
 
 int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf)
 {
-	char sec_buf[SECTOR_SIZE];
+	ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, SECTOR_SIZE);
 	unsigned block_len;
 
 	/* Check partition boundaries */
@@ -107,7 +107,7 @@
 	block_len = byte_len & ~(SECTOR_SIZE - 1);
 
 	if (block_len == 0) {
-		u8 p[SECTOR_SIZE];
+		ALLOC_CACHE_ALIGN_BUFFER(u8, p, SECTOR_SIZE);
 
 		block_len = SECTOR_SIZE;
 		ext4fs_block_dev_desc->block_read(ext4fs_block_dev_desc->dev,
diff --git a/fs/ext4/ext4_common.c b/fs/ext4/ext4_common.c
index 083e45e..3deffd5 100644
--- a/fs/ext4/ext4_common.c
+++ b/fs/ext4/ext4_common.c
@@ -71,7 +71,7 @@
 	uint64_t startblock;
 	uint64_t remainder;
 	unsigned char *temp_ptr = NULL;
-	unsigned char sec_buf[SECTOR_SIZE];
+	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, SECTOR_SIZE);
 	struct ext_filesystem *fs = get_fs();
 
 	startblock = off / (uint64_t)SECTOR_SIZE;
diff --git a/fs/ext4/ext4_common.h b/fs/ext4/ext4_common.h
index 801b8b8..0af625d 100644
--- a/fs/ext4/ext4_common.h
+++ b/fs/ext4/ext4_common.h
@@ -55,7 +55,12 @@
 #define SUPERBLOCK_SIZE	1024
 #define F_FILE			1
 
-#define zalloc(size) calloc(1, size)
+static inline void *zalloc(size_t size)
+{
+	void *p = memalign(ARCH_DMA_MINALIGN, size);
+	memset(p, 0, size);
+	return p;
+}
 
 extern unsigned long part_offset;
 int ext4fs_read_inode(struct ext2_data *data, int ino,