diff --git a/libtransmission/rpcimpl.cc b/libtransmission/rpcimpl.cc
index 3ca2081a7..fd7f966e6 100644
--- a/libtransmission/rpcimpl.cc
+++ b/libtransmission/rpcimpl.cc
@@ -1907,9 +1907,9 @@ void add_strings_from_var(std::set<std::string_view>& strings, tr_variant const&
             auto group_map = tr_variant::Map{ 6U };
             group_map.try_emplace(TR_KEY_honors_session_limits, group->are_parent_limits_honored(tr_direction::Up));
             group_map.try_emplace(TR_KEY_name, name.sv());
-            group_map.try_emplace(TR_KEY_speed_limit_down, limits.down_limit.count(Speed::Units::KByps));
+            group_map.try_emplace(TR_KEY_speed_limit_down, static_cast<int64_t>(limits.down_limit.count(Speed::Units::KByps)));
             group_map.try_emplace(TR_KEY_speed_limit_down_enabled, limits.down_limited);
-            group_map.try_emplace(TR_KEY_speed_limit_up, limits.up_limit.count(Speed::Units::KByps));
+            group_map.try_emplace(TR_KEY_speed_limit_up, static_cast<int64_t>(limits.up_limit.count(Speed::Units::KByps)));
             group_map.try_emplace(TR_KEY_speed_limit_up_enabled, limits.up_limited);
             groups_vec.emplace_back(std::move(group_map));
         }
@@ -2524,7 +2524,8 @@ using SessionAccessors = std::pair<SessionGetter, SessionSetter>;
 
     map.try_emplace(
         TR_KEY_speed_limit_down,
-        [](tr_session const& src) -> tr_variant { return src.speed_limit(tr_direction::Down).count(Speed::Units::KByps); },
+        [](tr_session const& src) -> tr_variant
+        { return static_cast<int64_t>(src.speed_limit(tr_direction::Down).count(Speed::Units::KByps)); },
         [](tr_session& tgt, tr_variant const& src, ErrorInfo& /*err*/)
         {
             if (auto const val = src.value_if<int64_t>())
@@ -2546,7 +2547,8 @@ using SessionAccessors = std::pair<SessionGetter, SessionSetter>;
 
     map.try_emplace(
         TR_KEY_speed_limit_up,
-        [](tr_session const& src) -> tr_variant { return src.speed_limit(tr_direction::Up).count(Speed::Units::KByps); },
+        [](tr_session const& src) -> tr_variant
+        { return static_cast<int64_t>(src.speed_limit(tr_direction::Up).count(Speed::Units::KByps)); },
         [](tr_session& tgt, tr_variant const& src, ErrorInfo& /*err*/)
         {
             if (auto const val = src.value_if<int64_t>())