diff --git a/server/tools/protobuild/metatable.proto b/server/tools/protobuild/metatable.proto
index b5084e2..cff1ee9 100755
--- a/server/tools/protobuild/metatable.proto
+++ b/server/tools/protobuild/metatable.proto
@@ -152,7 +152,7 @@ message Buff
     required string buff_param2 = 7;
     required string buff_param3 = 8;
     required string buff_param4 = 9;
-    required int32 duration_time = 10;
+    required float duration_time = 10;
 }
 
 message Drop