diff --git a/mkfile b/mkfile
index 03330cecb4f41b15ea8ba62c3b57b91a98c9e37e..80df5400ff00114893a38950803b4655009d0371 100644
--- a/mkfile
+++ b/mkfile
@@ -3,3 +3,4 @@
 run:
     $CC $CFLAGS tree.c
     $LD $LDFLAGS -o tree tree.$O
+
diff --git a/tree.c b/tree.c
index ab87cac29a7811d63088a6de5b47bf27111a32b6..e36fb3bf6403305e133aed231b8f0cc3b01f4a3d 100644
--- a/tree.c
+++ b/tree.c
@@ -4,7 +4,8 @@ #include <fcall.h>
 #include <thread.h>
 #include <9p.h>
 
-void print_tree(char *basepath, int depth, char *prefix, int max_depth)
+void
+print_tree(char *basepath, int depth, char *prefix, int max_depth)
 {
     Dir *dirs;
     int i, n, fd;
@@ -49,7 +50,8 @@     }
     close(fd);
 }
 
-void main(int argc, char *argv[])
+void
+main(int argc, char *argv[])
 {
     int max_depth = -1;
     char *start_dir = ".";
@@ -71,3 +73,4 @@
     print_tree(start_dir, 0, "", max_depth);
     exits(0);
 }
+