diff --git a/include/libremidi/backends/linux/pipewire/context.hpp b/include/libremidi/backends/linux/pipewire/context.hpp
index dfdeec63..51382683 100644
--- a/include/libremidi/backends/linux/pipewire/context.hpp
+++ b/include/libremidi/backends/linux/pipewire/context.hpp
@@ -1130,10 +1130,9 @@ class context : public std::enable_shared_from_this<context>
   void fill_port_from_props(port_info& p, const spa_dict* props) noexcept
   {
     if (auto v = dict_get(props, "format.dsp"); !v.empty())
-    {
       p.format = std::string{v};
-      p.kind = classify_format_dsp(p.format);
-    }
+    if (auto k = classify_port_props(props); k != media_class::other)
+      p.kind = k;
     if (auto v = dict_get(props, PW_KEY_PORT_NAME); !v.empty())
       p.port_name = std::string{v};
     if (auto v = dict_get(props, PW_KEY_PORT_ALIAS); !v.empty())
diff --git a/include/libremidi/backends/linux/pipewire/types.hpp b/include/libremidi/backends/linux/pipewire/types.hpp
index 07243cba..8eef2aa9 100644
--- a/include/libremidi/backends/linux/pipewire/types.hpp
+++ b/include/libremidi/backends/linux/pipewire/types.hpp
@@ -104,6 +104,13 @@ inline media_class classify_node_props(const spa_dict* props) noexcept
   return classify_media_class(dict_get(props, PW_KEY_MEDIA_CLASS));
 }
 
+inline media_class classify_port_props(const spa_dict* props) noexcept
+{
+  if (dict_get(props, "control.ump") == "true")
+    return media_class::ump;
+  return classify_format_dsp(dict_get(props, "format.dsp"));
+}
+
 struct port_info
 {
   std::uint32_t id{};
diff --git a/include/libremidi/backends/pipewire/helpers.hpp b/include/libremidi/backends/pipewire/helpers.hpp
index 5225ae23..1765acd7 100644
--- a/include/libremidi/backends/pipewire/helpers.hpp
+++ b/include/libremidi/backends/pipewire/helpers.hpp
@@ -210,14 +210,22 @@ struct pipewire_helpers
     this->flt->update_params(this->port, params, 1);
   }
 
+  static bool port_matches(
+      const libremidi::pipewire::port_info& port, libremidi::pipewire::media_class kind) noexcept
+  {
+    if (kind == libremidi::pipewire::media_class::ump)
+      return port.kind == libremidi::pipewire::media_class::ump;
+    return libremidi::pipewire::is_midi_like(port.kind);
+  }
+
   template <libremidi::API Api>
-  void add_callbacks(std::string format, const observer_configuration& conf)
+  void add_callbacks(libremidi::pipewire::media_class kind, const observer_configuration& conf)
   {
     assert(this->ctx);
 
     sub_added = this->ctx->on_port_added(
-        [this, format, &conf](const libremidi::pipewire::port_info& port) {
-          if (port.format.find(format) == std::string::npos)
+        [this, kind, &conf](const libremidi::pipewire::port_info& port) {
+          if (!port_matches(port, kind))
             return;
           this->port_cache[port.id] = port;
 
@@ -239,14 +247,14 @@ struct pipewire_helpers
         });
 
     sub_removed = this->ctx->on_port_removed(
-        [this, format, &conf](std::uint32_t port_id) {
+        [this, kind, &conf](std::uint32_t port_id) {
           auto it = this->port_cache.find(port_id);
           if (it == this->port_cache.end())
             return;
           const auto port = it->second;
           this->port_cache.erase(it);
 
-          if (port.format.find(format) == std::string::npos)
+          if (!port_matches(port, kind))
             return;
           bool unfiltered = conf.track_any;
           unfiltered |= (port.physical && conf.track_hardware);
@@ -420,7 +428,8 @@ struct pipewire_helpers
   // user-facing input port carries Direction=OUTPUT.
   template <spa_direction Direction, libremidi::API Api>
   static auto get_ports(
-      std::string_view format, const observer_configuration& conf, const context_t& ctx) noexcept
+      libremidi::pipewire::media_class kind, const observer_configuration& conf,
+      const context_t& ctx) noexcept
       -> std::vector<
           std::conditional_t<Direction == SPA_DIRECTION_OUTPUT, input_port, output_port>>
   {
@@ -433,7 +442,7 @@ struct pipewire_helpers
       const auto& bucket = (Direction == SPA_DIRECTION_INPUT ? node.inputs : node.outputs);
       for (const auto& port : bucket)
       {
-        if (port.format.find(format) == std::string::npos)
+        if (!port_matches(port, kind))
           continue;
         bool unfiltered = conf.track_any;
         unfiltered |= (port.physical && conf.track_hardware);
diff --git a/include/libremidi/backends/pipewire/observer.hpp b/include/libremidi/backends/pipewire/observer.hpp
index 285d954b..d773e94b 100644
--- a/include/libremidi/backends/pipewire/observer.hpp
+++ b/include/libremidi/backends/pipewire/observer.hpp
@@ -27,7 +27,8 @@ class observer_pipewire final
     // Hold thread_loop_lock so a port arriving between subscription
     // install and the snapshot walk doesn't fire twice.
     this->ctx->with_lock([this] {
-      this->add_callbacks<libremidi::API::PIPEWIRE>("midi", configuration);
+      this->add_callbacks<libremidi::API::PIPEWIRE>(
+          libremidi::pipewire::media_class::midi, configuration);
 
       if (configuration.notify_in_constructor)
       {
@@ -49,7 +50,7 @@ class observer_pipewire final
     if (!this->ctx)
       return {};
     return get_ports<SPA_DIRECTION_OUTPUT, libremidi::API::PIPEWIRE>(
-        "midi", this->configuration, *this->ctx);
+        libremidi::pipewire::media_class::midi, this->configuration, *this->ctx);
   }
 
   std::vector<libremidi::output_port> get_output_ports() const noexcept override
@@ -57,7 +58,7 @@ class observer_pipewire final
     if (!this->ctx)
       return {};
     return get_ports<SPA_DIRECTION_INPUT, libremidi::API::PIPEWIRE>(
-        "midi", this->configuration, *this->ctx);
+        libremidi::pipewire::media_class::midi, this->configuration, *this->ctx);
   }
 
   ~observer_pipewire() { destroy_context(); }
diff --git a/include/libremidi/backends/pipewire_ump/observer.hpp b/include/libremidi/backends/pipewire_ump/observer.hpp
index c21c21e9..6ce56644 100644
--- a/include/libremidi/backends/pipewire_ump/observer.hpp
+++ b/include/libremidi/backends/pipewire_ump/observer.hpp
@@ -27,7 +27,8 @@ class observer_pipewire final
 
     // Atomic subscribe + initial walk (see pipewire/observer.hpp).
     this->ctx->with_lock([this] {
-      this->add_callbacks<libremidi::API::PIPEWIRE_UMP>("UMP", configuration);
+      this->add_callbacks<libremidi::API::PIPEWIRE_UMP>(
+          libremidi::pipewire::media_class::ump, configuration);
 
       if (configuration.notify_in_constructor)
       {
@@ -52,7 +53,7 @@ class observer_pipewire final
     if (!this->ctx)
       return {};
     return get_ports<SPA_DIRECTION_OUTPUT, libremidi::API::PIPEWIRE_UMP>(
-        "UMP", this->configuration, *this->ctx);
+        libremidi::pipewire::media_class::ump, this->configuration, *this->ctx);
   }
 
   std::vector<libremidi::output_port> get_output_ports() const noexcept override
@@ -60,7 +61,7 @@ class observer_pipewire final
     if (!this->ctx)
       return {};
     return get_ports<SPA_DIRECTION_INPUT, libremidi::API::PIPEWIRE_UMP>(
-        "UMP", this->configuration, *this->ctx);
+        libremidi::pipewire::media_class::ump, this->configuration, *this->ctx);
   }
 
   ~observer_pipewire() { destroy_context(); }