diff --git a/src/boot.c b/src/boot.c
index 35a3f8e..3e0cde6 100644
--- a/src/boot.c
+++ b/src/boot.c
@@ -89,7 +89,7 @@ static void dump_boot(DOS_FS * fs, struct boot_sector *b, unsigned lss)
     printf("Boot sector contents:\n");
     if (!atari_format) {
 	char id[9];
-	strncpy(id, b->system_id, 8);
+	strncpy(id, (const char*)b->system_id, 8);
 	id[8] = 0;
 	printf("System ID \"%s\"\n", id);
     } else {
diff --git a/src/check.c b/src/check.c
index 5b72602..f477f8c 100644
--- a/src/check.c
+++ b/src/check.c
@@ -139,7 +139,7 @@ loff_t alloc_rootdir_entry(DOS_FS * fs, DIR_ENT * de, const char *pattern)
 	    while (clu_num > 0 && clu_num != -1) {
 		fs_read(offset2, sizeof(DIR_ENT), &d2);
 		if (offset2 != offset &&
-		    !strncmp(d2.name, de->name, MSDOS_NAME))
+		    !strncmp((const char*)d2.name, (const char*)de->name, MSDOS_NAME))
 		    break;
 		i += sizeof(DIR_ENT);
 		offset2 += sizeof(DIR_ENT);
@@ -173,10 +173,10 @@ loff_t alloc_rootdir_entry(DOS_FS * fs, DIR_ENT * de, const char *pattern)
 	offset = fs->root_start + next_free * sizeof(DIR_ENT);
 	memset(de, 0, sizeof(DIR_ENT));
 	while (1) {
-	    sprintf(de->name, pattern, curr_num);
+	    sprintf((char*)de->name, pattern, curr_num);
 	    for (scan = 0; scan < fs->root_entries; scan++)
 		if (scan != next_free &&
-		    !strncmp(root[scan].name, de->name, MSDOS_NAME))
+		    !strncmp((const char*)root[scan].name, (const char*)de->name, MSDOS_NAME))
 		    break;
 	    if (scan == fs->root_entries)
 		break;
@@ -262,8 +262,8 @@ static int bad_name(DOS_FILE * file)
 
     /* Do not complain about (and auto-correct) the extended attribute files
      * of OS/2. */
-    if (strncmp(name, "EA DATA  SF", 11) == 0 ||
-	strncmp(name, "WP ROOT  SF", 11) == 0)
+    if (strncmp((const char*)name, "EA DATA  SF", 11) == 0 ||
+	strncmp((const char*)name, "WP ROOT  SF", 11) == 0)
 	return 0;
 
     /* don't complain about the dummy 11 bytes used by patched Linux
@@ -322,7 +322,6 @@ static int bad_name(DOS_FILE * file)
 
 static void lfn_remove(loff_t from, loff_t to)
 {
-    int i;
     DIR_ENT empty;
 
     /* New dir entry is zeroed except first byte, which is set to 0xe5.
@@ -387,13 +386,13 @@ static void auto_rename(DOS_FILE * file)
 	memcpy(file->dir_ent.ext, num + 4, 3);
 	for (walk = first; walk; walk = walk->next)
 	    if (walk != file
-		&& !strncmp(walk->dir_ent.name, file->dir_ent.name, MSDOS_NAME))
+		&& !strncmp((const char*)walk->dir_ent.name, (const char*)file->dir_ent.name, MSDOS_NAME))
 		break;
 	if (!walk) {
 	    fs_write(file->offset, MSDOS_NAME, file->dir_ent.name);
 	    if (file->lfn)
 		lfn_fix_checksum(file->lfn_offset, file->offset,
-				 file->dir_ent.name);
+				 (const char*)file->dir_ent.name);
 	    return;
 	}
 	number++;
@@ -416,10 +415,10 @@ static void rename_file(DOS_FILE * file)
     while (1) {
 	printf("New name: ");
 	fflush(stdout);
-	if (fgets(name, 45, stdin)) {
-	    if ((here = strchr(name, '\n')))
+	if (fgets((char*)name, 45, stdin)) {
+	    if ((here = (unsigned char*)strchr((const char*)name, '\n')))
 		*here = 0;
-	    for (walk = strrchr(name, 0); walk >= name && (*walk == ' ' ||
+	    for (walk = (unsigned char*)strrchr((const char*)name, 0); walk >= name && (*walk == ' ' ||
 							   *walk == '\t');
 		 walk--) ;
 	    walk[1] = 0;
@@ -428,7 +427,7 @@ static void rename_file(DOS_FILE * file)
 		fs_write(file->offset, MSDOS_NAME, file->dir_ent.name);
 		if (file->lfn)
 		    lfn_fix_checksum(file->lfn_offset, file->offset,
-				     file->dir_ent.name);
+				     (const char*)file->dir_ent.name);
 		return;
 	    }
 	}
@@ -439,7 +438,7 @@ static int handle_dot(DOS_FS * fs, DOS_FILE * file, int dots)
 {
     char *name;
 
-    name = strncmp(file->dir_ent.name, MSDOS_DOT, MSDOS_NAME) ? ".." : ".";
+    name = strncmp((const char*)file->dir_ent.name, MSDOS_DOT, MSDOS_NAME) ? ".." : ".";
     if (!(file->dir_ent.attr & ATTR_DIR)) {
 	printf("%s\n  Is a non-directory.\n", path_name(file));
 	if (interactive)
@@ -484,7 +483,7 @@ static int check_file(DOS_FS * fs, DOS_FILE * file)
 		   path_name(file));
 	    MODIFY(file, size, CT_LE_L(0));
 	}
-	if (file->parent && !strncmp(file->dir_ent.name, MSDOS_DOT, MSDOS_NAME)) {
+	if (file->parent && !strncmp((const char*)file->dir_ent.name, MSDOS_DOT, MSDOS_NAME)) {
 	    expect = FSTART(file->parent, fs);
 	    if (FSTART(file, fs) != expect) {
 		printf("%s\n  Start (%ld) does not point to parent (%ld)\n",
@@ -493,7 +492,7 @@ static int check_file(DOS_FS * fs, DOS_FILE * file)
 	    }
 	    return 0;
 	}
-	if (file->parent && !strncmp(file->dir_ent.name, MSDOS_DOTDOT,
+	if (file->parent && !strncmp((const char*)file->dir_ent.name, MSDOS_DOTDOT,
 				     MSDOS_NAME)) {
 	    expect =
 		file->parent->parent ? FSTART(file->parent->parent, fs) : 0;
@@ -678,13 +677,13 @@ static int check_dir(DOS_FS * fs, DOS_FILE ** root, int dots)
     dot = dotdot = redo = 0;
     walk = root;
     while (*walk) {
-	if (!strncmp((*walk)->dir_ent.name, MSDOS_DOT, MSDOS_NAME) ||
-	    !strncmp((*walk)->dir_ent.name, MSDOS_DOTDOT, MSDOS_NAME)) {
+	if (!strncmp((const char*)((*walk)->dir_ent.name), MSDOS_DOT, MSDOS_NAME) ||
+	    !strncmp((const char*)((*walk)->dir_ent.name), MSDOS_DOTDOT, MSDOS_NAME)) {
 	    if (handle_dot(fs, *walk, dots)) {
 		*walk = (*walk)->next;
 		continue;
 	    }
-	    if (!strncmp((*walk)->dir_ent.name, MSDOS_DOT, MSDOS_NAME))
+	    if (!strncmp((const char*)((*walk)->dir_ent.name), MSDOS_DOT, MSDOS_NAME))
 		dot++;
 	    else
 		dotdot++;
@@ -921,10 +920,10 @@ static void add_file(DOS_FS * fs, DOS_FILE *** chain, DOS_FILE * parent,
 	de.start = CT_LE_W(fs->root_cluster & 0xffff);
 	de.starthi = CT_LE_W((fs->root_cluster >> 16) & 0xffff);
     }
-    if ((type = file_type(cp, de.name)) != fdt_none) {
+    if ((type = file_type(cp, (char*)de.name)) != fdt_none) {
 	if (type == fdt_undelete && (de.attr & ATTR_DIR))
 	    die("Can't undelete directories.");
-	file_modify(cp, de.name);
+	file_modify(cp, (char*)de.name);
 	fs_write(offset, 1, &de);
     }
     if (IS_FREE(de.name)) {
@@ -953,8 +952,8 @@ static void add_file(DOS_FS * fs, DOS_FILE *** chain, DOS_FILE * parent,
     }
     /* Don't include root directory, '.', or '..' in the total file count */
     if (offset &&
-	strncmp(de.name, MSDOS_DOT, MSDOS_NAME) != 0 &&
-	strncmp(de.name, MSDOS_DOTDOT, MSDOS_NAME) != 0)
+	strncmp((const char*)de.name, MSDOS_DOT, MSDOS_NAME) != 0 &&
+	strncmp((const char*)de.name, MSDOS_DOTDOT, MSDOS_NAME) != 0)
 	++n_files;
     test_file(fs, new, test);	/* Bad cluster check */
 }
@@ -1003,9 +1002,9 @@ static int subdirs(DOS_FS * fs, DOS_FILE * parent, FDSC ** cp)
 
     for (walk = parent ? parent->first : root; walk; walk = walk->next)
 	if (walk->dir_ent.attr & ATTR_DIR)
-	    if (strncmp(walk->dir_ent.name, MSDOS_DOT, MSDOS_NAME) &&
-		strncmp(walk->dir_ent.name, MSDOS_DOTDOT, MSDOS_NAME))
-		if (scan_dir(fs, walk, file_cd(cp, walk->dir_ent.name)))
+	    if (strncmp((const char*)walk->dir_ent.name, MSDOS_DOT, MSDOS_NAME) &&
+		strncmp((const char*)walk->dir_ent.name, MSDOS_DOTDOT, MSDOS_NAME))
+		if (scan_dir(fs, walk, file_cd(cp, (char*)walk->dir_ent.name)))
 		    return 1;
     return 0;
 }
diff --git a/src/file.c b/src/file.c
index 4352520..6891d39 100644
--- a/src/file.c
+++ b/src/file.c
@@ -75,7 +75,7 @@ char *file_name(unsigned char *fixed)
 		*p++ = ' ';
 	    put_char(&p, fixed[i]);
 	}
-    if (strncmp(fixed + 8, "   ", 3)) {
+    if (strncmp((const char*)(fixed + 8), "   ", 3)) {
 	*p++ = '.';
 	for (i = j = 0; i < 3; i++)
 	    if (fixed[i + 8] != ' ') {
@@ -162,7 +162,7 @@ void file_add(char *path, FD_TYPE type)
     while (1) {
 	if ((here = strchr(path, '/')))
 	    *here = 0;
-	if (!file_cvt(path, name))
+	if (!file_cvt((unsigned char*)path, (unsigned char*)name))
 	    exit(2);
 	for (walk = *current; walk; walk = walk->next)
 	    if (!here && (!strncmp(name, walk->name, MSDOS_NAME) || (type ==
@@ -245,12 +245,12 @@ void file_modify(FDSC ** curr, char *fixed)
 	die("Internal error: file_find failed");
     switch ((*this)->type) {
     case fdt_drop:
-	printf("Dropping %s\n", file_name(fixed));
+	printf("Dropping %s\n", file_name((unsigned char*)fixed));
 	*(unsigned char *)fixed = DELETED_FLAG;
 	break;
     case fdt_undelete:
 	*fixed = *(*this)->name;
-	printf("Undeleting %s\n", file_name(fixed));
+	printf("Undeleting %s\n", file_name((unsigned char*)fixed));
 	break;
     default:
 	die("Internal error: file_modify");
@@ -270,7 +270,7 @@ static void report_unused(FDSC * this)
 	    report_unused(this->first);
 	else if (this->type != fdt_none)
 	    printf("Warning: did not %s file %s\n", this->type == fdt_drop ?
-		   "drop" : "undelete", file_name(this->name));
+		   "drop" : "undelete", file_name((unsigned char*)this->name));
 	free(this);
 	this = next;
     }
diff --git a/src/lfn.c b/src/lfn.c
index 543dc44..209ab9a 100644
--- a/src/lfn.c
+++ b/src/lfn.c
@@ -74,7 +74,7 @@ static unsigned char fat_uni2esc[64] = {
 /* Convert name part in 'lfn' from unicode to ASCII */
 #define CNV_THIS_PART(lfn)				\
     ({							\
-	char __part_uni[CHARS_PER_LFN*2];		\
+	unsigned char __part_uni[CHARS_PER_LFN*2];		\
 	copy_lfn_part( __part_uni, lfn );		\
 	cnv_unicode( __part_uni, CHARS_PER_LFN, 0 );	\
     })
@@ -120,10 +120,10 @@ static char *cnv_unicode(const unsigned char *uni, int maxlen, int use_q)
     }
     *cp = 0;
 
-    return (out);
+    return (char*)out;
 }
 
-static void copy_lfn_part(char *dst, LFN_ENT * lfn)
+static void copy_lfn_part(unsigned char *dst, LFN_ENT *lfn)
 {
     memcpy(dst, lfn->name0_4, 10);
     memcpy(dst + 10, lfn->name5_10, 12);
diff --git a/src/mkdosfs.c b/src/mkdosfs.c
index 1f44eaf..f92d307 100644
--- a/src/mkdosfs.c
+++ b/src/mkdosfs.c
@@ -760,7 +760,7 @@ static void setup_tables(void)
 	 * :-), then 6 bytes filler (ignored), then 3 byte serial number. */
 	memcpy(bs.system_id - 1, "mkdosf", 6);
     else
-	strcpy(bs.system_id, "mkdosfs");
+	strcpy((char*)bs.system_id, "mkdosfs");
     if (sectors_per_cluster)
 	bs.cluster_size = (char)sectors_per_cluster;
     if (size_fat == 32) {