3 files changed, 3 insertions, 5 deletions

diff --git a/src/avl-tree.c b/src/avl-tree.c
index 5059f3f..fcd9e37 100644
--- a/src/avl-tree.c
+++ b/src/avl-tree.c
@@ -336,10 +336,8 @@ print(struct tree_node *tree)
 }
 
 int
-main()
+main(void)
 {
-
-
 #if 0   /* 1a/b */
         tree = insert(tree, 20);
         tree = insert(tree,  4);
diff --git a/src/list-tail-node.c b/src/list-tail-node.c
index edfcf31..524e5bb 100644
--- a/src/list-tail-node.c
+++ b/src/list-tail-node.c
@@ -171,7 +171,7 @@ list_free(struct list *list)
 /* -->8-- */
 
 int
-main()
+main(void)
 {
         struct list list[1];
 
diff --git a/src/queue.c b/src/queue.c
index 6a472ee..5d25d65 100644
--- a/src/queue.c
+++ b/src/queue.c
@@ -91,7 +91,7 @@ queue_free(struct queue *queue)
 /* -->8-- */
 
 int
-main()
+main(void)
 {
         struct queue queue[1];