diff --git a/gnu/local.mk b/gnu/local.mk
index 8e7abc8a47..104fcb01d6 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -2287,6 +2287,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/wacomtablet-add-missing-includes.patch	\
   %D%/packages/patches/wacomtablet-qt5.15.patch			\
   %D%/packages/patches/warsow-qfusion-fix-bool-return-type.patch	\
+  %D%/packages/patches/waybar-0.11.0-fix-tray-icons.patch	\
   %D%/packages/patches/wcstools-extend-makefiles.patch	\
   %D%/packages/patches/wdl-link-libs-and-fix-jnetlib.patch	\
   %D%/packages/patches/webkitgtk-adjust-bubblewrap-paths.patch	\
diff --git a/gnu/packages/patches/waybar-0.11.0-fix-tray-icons.patch b/gnu/packages/patches/waybar-0.11.0-fix-tray-icons.patch
new file mode 100644
index 0000000000..5c8c98a661
--- /dev/null
+++ b/gnu/packages/patches/waybar-0.11.0-fix-tray-icons.patch
@@ -0,0 +1,86 @@
+Taken from upstream's merged PR #3604 [1].
+
+[1] https://github.com/Alexays/Waybar/pull/3604
+
+From 0006e4713ae19776528038b3242ded05db884ba5 Mon Sep 17 00:00:00 2001
+From: Aleksei Bavshin <alebastr89@gmail.com>
+Date: Sat, 14 Sep 2024 07:37:37 -0700
+Subject: [PATCH 2/2] fix(tray): revert ustring formatting changes
+
+This reverts commit a4d31ab10d1630cb9104c695d7b777ca12468904.
+---
+ src/modules/sni/item.cpp | 23 +++++++++--------------
+ 1 file changed, 9 insertions(+), 14 deletions(-)
+
+diff --git a/src/modules/sni/item.cpp b/src/modules/sni/item.cpp
+index 8afb39fb3..6c4ec8c06 100644
+--- a/src/modules/sni/item.cpp
++++ b/src/modules/sni/item.cpp
+@@ -104,11 +104,9 @@ void Item::proxyReady(Glib::RefPtr<Gio::AsyncResult>& result) {
+     this->updateImage();
+ 
+   } catch (const Glib::Error& err) {
+-    spdlog::error("Failed to create DBus Proxy for {} {}: {}", bus_name, object_path,
+-                  std::string(err.what()));
++    spdlog::error("Failed to create DBus Proxy for {} {}: {}", bus_name, object_path, err.what());
+   } catch (const std::exception& err) {
+-    spdlog::error("Failed to create DBus Proxy for {} {}: {}", bus_name, object_path,
+-                  std::string(err.what()));
++    spdlog::error("Failed to create DBus Proxy for {} {}: {}", bus_name, object_path, err.what());
+   }
+ }
+ 
+@@ -126,15 +124,14 @@ ToolTip get_variant<ToolTip>(const Glib::VariantBase& value) {
+   result.text = get_variant<Glib::ustring>(container.get_child(2));
+   auto description = get_variant<Glib::ustring>(container.get_child(3));
+   if (!description.empty()) {
+-    result.text = fmt::format("<b>{}</b>\n{}", std::string(result.text), std::string(description));
++    result.text = fmt::format("<b>{}</b>\n{}", result.text, description);
+   }
+   return result;
+ }
+ 
+ void Item::setProperty(const Glib::ustring& name, Glib::VariantBase& value) {
+   try {
+-    spdlog::trace("Set tray item property: {}.{} = {}", id.empty() ? bus_name : id,
+-                  std::string(name), get_variant<std::string>(value));
++    spdlog::trace("Set tray item property: {}.{} = {}", id.empty() ? bus_name : id, name, value);
+ 
+     if (name == "Category") {
+       category = get_variant<std::string>(value);
+@@ -179,12 +176,10 @@ void Item::setProperty(const Glib::ustring& name, Glib::VariantBase& value) {
+     }
+   } catch (const Glib::Error& err) {
+     spdlog::warn("Failed to set tray item property: {}.{}, value = {}, err = {}",
+-                 id.empty() ? bus_name : id, std::string(name), get_variant<std::string>(value),
+-                 std::string(err.what()));
++                 id.empty() ? bus_name : id, name, value, err.what());
+   } catch (const std::exception& err) {
+     spdlog::warn("Failed to set tray item property: {}.{}, value = {}, err = {}",
+-                 id.empty() ? bus_name : id, std::string(name), get_variant<std::string>(value),
+-                 std::string(err.what()));
++                 id.empty() ? bus_name : id, name, value, err.what());
+   }
+ }
+ 
+@@ -226,9 +221,9 @@ void Item::processUpdatedProperties(Glib::RefPtr<Gio::AsyncResult>& _result) {
+ 
+     this->updateImage();
+   } catch (const Glib::Error& err) {
+-    spdlog::warn("Failed to update properties: {}", std::string(err.what()));
++    spdlog::warn("Failed to update properties: {}", err.what());
+   } catch (const std::exception& err) {
+-    spdlog::warn("Failed to update properties: {}", std::string(err.what()));
++    spdlog::warn("Failed to update properties: {}", err.what());
+   }
+   update_pending_.clear();
+ }
+@@ -250,7 +245,7 @@ static const std::map<std::string_view, std::set<std::string_view>> signal2props
+ 
+ void Item::onSignal(const Glib::ustring& sender_name, const Glib::ustring& signal_name,
+                     const Glib::VariantContainerBase& arguments) {
+-  spdlog::trace("Tray item '{}' got signal {}", id, std::string(signal_name));
++  spdlog::trace("Tray item '{}' got signal {}", id, signal_name);
+   auto changed = signal2props.find(signal_name.raw());
+   if (changed != signal2props.end()) {
+     if (update_pending_.empty()) {
diff --git a/gnu/packages/wm.scm b/gnu/packages/wm.scm
index 4b9d116bda..2e00e0df41 100644
--- a/gnu/packages/wm.scm
+++ b/gnu/packages/wm.scm
@@ -2233,7 +2233,8 @@ (define-public waybar
              (commit version)))
        (file-name (git-file-name name version))
        (sha256
-        (base32 "1bw6d3bf8rm4mgrbcprxxljfxbyabbj2lwabk2z19r8lhfz38myy"))))
+        (base32 "1bw6d3bf8rm4mgrbcprxxljfxbyabbj2lwabk2z19r8lhfz38myy"))
+       (patches (search-patches "waybar-0.11.0-fix-tray-icons.patch"))))
     (build-system meson-build-system)
     (arguments
      (list #:configure-flags #~(list "--wrap-mode=nodownload")))
