diff --git a/src/includes/aria2/aria2.h b/src/includes/aria2/aria2.h
index 6c9b5651..92e11ede 100644
--- a/src/includes/aria2/aria2.h
+++ b/src/includes/aria2/aria2.h
@@ -140,10 +140,6 @@ enum DownloadEvent {
  * The segment information.
  */
 struct SegmentInfo {
-  /**
-   * The constructor fills default values for all members.
-   */
-  SegmentInfo();
   /**
    * The index of a piece. 
    * The default value is ``0``.