diff --git a/minix/commands/devmand/main.c b/minix/commands/devmand/main.c
index 25cc0b8a8..14810fc64 100644
--- a/minix/commands/devmand/main.c
+++ b/minix/commands/devmand/main.c
@@ -544,7 +544,7 @@ static enum dev_type determine_type (char *path)
 		return DEV_TYPE_UNKOWN;
 	}
 
-	res = fscanf(fd , "%256s\n", buf);
+	res = fscanf(fd , "%255s\n", buf);
 	fclose(fd);
 
 	if (res != 1) {