diff --git a/server/tools/protobuild/metatable.proto b/server/tools/protobuild/metatable.proto
index 45704be..04a6448 100755
--- a/server/tools/protobuild/metatable.proto
+++ b/server/tools/protobuild/metatable.proto
@@ -247,7 +247,7 @@ message AI
     optional string random_move_idle_time = 8;
     optional string random_move_time = 9;
     optional int32 attack_range = 10;
-    optional int32 attack_rate = 11;
+    optional float attack_rate = 11;
 }
 
 //end