diff --git a/libntfs/mst.c b/libntfs/mst.c
index 41f42eeb..530b2722 100644
--- a/libntfs/mst.c
+++ b/libntfs/mst.c
@@ -48,7 +48,7 @@ int ntfs_mst_post_read_fixup(NTFS_RECORD *b, const u32 size)
 	usa_count = le16_to_cpu(b->usa_count) - 1;
 	/* Size and alignment checks. */
 	if (size & (NTFS_SECTOR_SIZE - 1) || usa_ofs & 1 ||
-			usa_ofs + (usa_count * 2) > size ||
+			(u32)(usa_ofs + (usa_count * 2)) > size ||
 			(size >> NTFS_SECTOR_SIZE_BITS) != usa_count) {
 		errno = EINVAL;
 		return -1;
@@ -136,7 +136,7 @@ int ntfs_mst_pre_write_fixup(NTFS_RECORD *b, const u32 size)
 	usa_count = le16_to_cpu(b->usa_count) - 1;
 	/* Size and alignment checks. */
 	if (size & (NTFS_SECTOR_SIZE - 1) || usa_ofs & 1 ||
-			usa_ofs + (usa_count * 2) > size ||
+			(u32)(usa_ofs + (usa_count * 2)) > size ||
 			(size >> NTFS_SECTOR_SIZE_BITS) != usa_count) {
 		errno = EINVAL;
 		return -1;
diff --git a/libntfs/runlist.c b/libntfs/runlist.c
index ef76280b..cc17870b 100644
--- a/libntfs/runlist.c
+++ b/libntfs/runlist.c
@@ -771,7 +771,7 @@ runlist_element *ntfs_mapping_pairs_decompress(const ntfs_volume *vol,
 		 * Allocate more memory if needed, including space for the
 		 * not-mapped and terminator elements.
 		 */
-		if (((rlpos + 3) * sizeof(*old_rl)) > rlsize) {
+		if ((int)((rlpos + 3) * sizeof(*old_rl)) > rlsize) {
 			runlist_element *rl2;
 
 			rlsize += 0x1000;
diff --git a/libntfs/unistr.c b/libntfs/unistr.c
index 848d9f9d..a8267af5 100644
--- a/libntfs/unistr.c
+++ b/libntfs/unistr.c
@@ -342,7 +342,7 @@ int ntfs_ucstombs(const uchar_t *ins, const int ins_len, char **outs,
 	memset(&mbstate, 0, sizeof(mbstate));
 	for (i = o = 0; i < ins_len; i++) {
 		/* Reallocate memory if necessary or abort. */
-		if (o + MB_CUR_MAX > mbs_len) {
+		if ((int)(o + MB_CUR_MAX) > mbs_len) {
 			char *tc;
 			if (mbs == *outs) {
 				errno = ENAMETOOLONG;
diff --git a/libntfs/volume.c b/libntfs/volume.c
index 17d32d4b..7099a2af 100644
--- a/libntfs/volume.c
+++ b/libntfs/volume.c
@@ -839,7 +839,7 @@ ntfs_volume *ntfs_device_mount(struct ntfs_device *dev, unsigned long rwflag)
 					"name!");
 			goto error_exit;
 		}
-		for (j = 0; j < u; j++) {
+		for (j = 0; j < (s32)u; j++) {
 			uchar_t uc = le16_to_cpu(vname[j]);
 			if (uc > 0xff)
 				uc = (uchar_t)'_';