diff --git a/src/editing_area/level.c b/src/editing_area/level.c
index d7c6004..f6e44ff 100644
--- a/src/editing_area/level.c
+++ b/src/editing_area/level.c
@@ -11,13 +11,13 @@ static const int kble_fmt_version = 0;
 
 static int read_byte(FILE *file);
 static Tile read_byte_group(FILE *file, int size);
-static int write_byte(FILE *file, char byte);
+static int write_byte(FILE *file, unsigned char byte);
 static int write_byte_group(FILE *file, Tile value, int size);
 
 int level_read(struct Level *level, char *path)
 {
 	FILE *file = NULL;
-	char byte = 0;
+	unsigned char byte = 0;
 	unsigned int tile_size = 0;
 	int level_size = 0;
 	int i = 0;
@@ -114,12 +114,11 @@ int level_write(struct Level level, char *path)
 	for (i = 0; i < level_size; i += 1) {
 		tile = level.data[i];
 		tile_size = 1;
-		while (tile >>= 8) {
+		while (tile >>= 8)
 			tile_size += 1;
-			INFO_VAR("%d", tile);
-		}
 		if (tile_size > max_tile_size) {
 			max_tile_size = tile_size;
+			INFO_VAR("%d", max_tile_size);
 		}
 	}
 	INFO("max tile size is");
@@ -162,7 +161,7 @@ static int read_byte(FILE *file)
 static Tile read_byte_group(FILE *file, int size)
 {
 	int group = 0;
-	char *byte_ptr = (char *)&group;
+	unsigned char *byte_ptr = (unsigned char *)&group;
 	int value = 0;
 	int i = 0;
 	byte_ptr += size;
@@ -176,7 +175,7 @@ static Tile read_byte_group(FILE *file, int size)
 }
 
 /* Write a single byte safely (handle EOF). Return -1 if error. */
-static int write_byte(FILE *file, char byte)
+static int write_byte(FILE *file, unsigned char byte)
 {
 	const int result = fputc(byte, file);
 	if (result == EOF) {
@@ -189,7 +188,7 @@ static int write_byte(FILE *file, char byte)
 /* Write an integer as multiple bytes. Return -1 if error. */
 static int write_byte_group(FILE *file, Tile value, int size)
 {
-	char *value_ptr = (char *)&value;
+	unsigned char *value_ptr = (unsigned char *)&value;
 	value_ptr += size;
 	int error;
 	int i = 0;