1 files changed, 2 insertions, 2 deletions
diff --git a/queue.h b/queue.h
index d2227ac..ee8ea43 100644
--- a/queue.h
+++ b/queue.h
@@ -41,9 +41,9 @@ struct Queue {
 };
 
 void initqueue(struct Queue* queue);
-int isempty(struct Queue* queue);
+int isempty(const struct Queue* queue);
 void* dequeue(struct Queue* queue);
-void *examine(struct Queue* queue);
+void *examine(const struct Queue* queue);
 void enqueue(struct Queue* queue, void* item);
 
 #endif