diff --git a/src/Interpreters/ProcessList.cpp b/src/Interpreters/ProcessList.cpp
index 6cb50b310ad..f8a808f6c68 100644
--- a/src/Interpreters/ProcessList.cpp
+++ b/src/Interpreters/ProcessList.cpp
@@ -258,7 +258,7 @@ ProcessList::insert(const String & query_, const IAST * ast, ContextMutablePtr q
                 query_context,
                 query_,
                 client_info,
-                priorities.insert(static_cast<int>(settings.priority)),
+                priorities.insert(settings.priority),
                 std::move(thread_group),
                 query_kind,
                 settings,
diff --git a/src/Interpreters/QueryPriorities.h b/src/Interpreters/QueryPriorities.h
index 9e18e7bcff3..7601c7ba6eb 100644
--- a/src/Interpreters/QueryPriorities.h
+++ b/src/Interpreters/QueryPriorities.h
@@ -31,7 +31,7 @@ namespace DB
 class QueryPriorities
 {
 public:
-    using Priority = int;
+    using Priority = size_t;
 
 private:
     friend struct Handle;