diff --git a/src/main/java/com/ntlab/irisserver/entities/Turn.java b/src/main/java/com/ntlab/irisserver/entities/Turn.java
index 63bd815..7021417 100644
--- a/src/main/java/com/ntlab/irisserver/entities/Turn.java
+++ b/src/main/java/com/ntlab/irisserver/entities/Turn.java
@@ -15,7 +15,7 @@
     private String team;
 
     @JsonProperty("max")
-    private int max;
+    private Integer max;
 
     @JsonProperty("turnstate")
     private int turnstate; //0:スパイマスターのターン 1:諜報員のターン
diff --git a/src/main/java/com/ntlab/irisserver/resources/TurnsRest.java b/src/main/java/com/ntlab/irisserver/resources/TurnsRest.java
index 7f58687..2861983 100644
--- a/src/main/java/com/ntlab/irisserver/resources/TurnsRest.java
+++ b/src/main/java/com/ntlab/irisserver/resources/TurnsRest.java
@@ -81,7 +81,7 @@
 
     @PUT //ヒントと最大数を入力することで諜報員のターンに遷移する
     @Path("/{rid}/game/turns/{tno}/hint")
-    public void putHint(@PathParam("rid") String rid, @PathParam("tno") int tno, @FormParam("hint") String hint, @FormParam("max") int max){
+    public void putHint(@PathParam("rid") String rid, @PathParam("tno") int tno, @FormParam("hint") String hint, @FormParam("max") Integer max){
 
         RoomManager rm = RoomManager.getInstance();
         Room room = rm.getRoom(rid);