diff --git a/src/randomx.h b/src/randomx.h
index fb503ec..7996324 100644
--- a/src/randomx.h
+++ b/src/randomx.h
@@ -87,7 +87,7 @@ randomx_dataset *randomx_alloc_dataset(randomx_flags flags);
  *
  * @return the number of items contained in the dataset.
 */
-unsigned long randomx_dataset_item_count();
+unsigned long randomx_dataset_item_count(void);
 
 /**
  * Initializes dataset items.