diff --git a/include/modules/hyprland/window.hpp b/include/modules/hyprland/window.hpp
index 2c2ed972..1423aece 100644
--- a/include/modules/hyprland/window.hpp
+++ b/include/modules/hyprland/window.hpp
@@ -19,7 +19,6 @@ class Window : public waybar::ALabel {
  private:
   uint getActiveWorkspaceID(std::string);
   std::string getLastWindowTitle(uint);
-  std::string rewriteTitle(const std::string&);
   void onEvent(const std::string&);
 
   bool separate_outputs;
diff --git a/include/modules/sway/window.hpp b/include/modules/sway/window.hpp
index c99ba7f7..c13d5cee 100644
--- a/include/modules/sway/window.hpp
+++ b/include/modules/sway/window.hpp
@@ -24,7 +24,6 @@ class Window : public AIconLabel, public sigc::trackable {
   std::tuple<std::size_t, int, std::string, std::string, std::string, std::string> getFocusedNode(
       const Json::Value& nodes, std::string& output);
   void getTree();
-  std::string rewriteTitle(const std::string& title);
   void updateAppIconName();
   void updateAppIcon();
 
diff --git a/include/util/rewrite_title.hpp b/include/util/rewrite_title.hpp
new file mode 100644
index 00000000..c477339e
--- /dev/null
+++ b/include/util/rewrite_title.hpp
@@ -0,0 +1,8 @@
+#pragma once
+#include <json/json.h>
+
+#include <string>
+
+namespace waybar::util {
+std::string rewriteTitle(const std::string&, const Json::Value&);
+}
diff --git a/meson.build b/meson.build
index e537bcca..e72d99f4 100644
--- a/meson.build
+++ b/meson.build
@@ -157,7 +157,8 @@ src_files = files(
     'src/config.cpp',
     'src/group.cpp',
     'src/util/ustring_clen.cpp',
-    'src/util/sanitize_str.cpp'
+    'src/util/sanitize_str.cpp',
+    'src/util/rewrite_title.cpp'
 )
 
 if is_linux
diff --git a/src/modules/hyprland/window.cpp b/src/modules/hyprland/window.cpp
index 0d22fe03..e49561df 100644
--- a/src/modules/hyprland/window.cpp
+++ b/src/modules/hyprland/window.cpp
@@ -8,6 +8,7 @@
 #include "modules/hyprland/backend.hpp"
 #include "util/command.hpp"
 #include "util/json.hpp"
+#include "util/rewrite_title.hpp"
 
 namespace waybar::modules::hyprland {
 
@@ -33,7 +34,7 @@ auto Window::update() -> void {
 
   if (!format_.empty()) {
     label_.show();
-    label_.set_markup(fmt::format(format_, rewriteTitle(lastView)));
+    label_.set_markup(fmt::format(format_, waybar::util::rewriteTitle(lastView, config_["rewrite"])));
   } else {
     label_.hide();
   }
@@ -61,7 +62,7 @@ std::string Window::getLastWindowTitle(uint workspaceID) {
     return workspace["id"].as<uint>() == workspaceID;
   });
 
-  if (workspace != std::end(json)) {
+  if (workspace == std::end(json)) {
     return "";
   }
   return (*workspace)["lastwindowtitle"].as<std::string>();
@@ -87,31 +88,4 @@ void Window::onEvent(const std::string& ev) {
 
   dp.emit();
 }
-
-std::string Window::rewriteTitle(const std::string& title) {
-  const auto& rules = config_["rewrite"];
-  if (!rules.isObject()) {
-    return title;
-  }
-
-  std::string res = title;
-
-  for (auto it = rules.begin(); it != rules.end(); ++it) {
-    if (it.key().isString() && it->isString()) {
-      try {
-        // malformated regexes will cause an exception.
-        // in this case, log error and try the next rule.
-        const std::regex rule{it.key().asString()};
-        if (std::regex_match(title, rule)) {
-          res = std::regex_replace(res, rule, it->asString());
-        }
-      } catch (const std::regex_error& e) {
-        spdlog::error("Invalid rule {}: {}", it.key().asString(), e.what());
-      }
-    }
-  }
-
-  return res;
-}
-
 }  // namespace waybar::modules::hyprland
\ No newline at end of file
diff --git a/src/modules/sway/window.cpp b/src/modules/sway/window.cpp
index 3d63743f..499c08c0 100644
--- a/src/modules/sway/window.cpp
+++ b/src/modules/sway/window.cpp
@@ -1,4 +1,5 @@
 #include "modules/sway/window.hpp"
+#include "util/rewrite_title.hpp"
 
 #include <gdkmm/pixbuf.h>
 #include <glibmm/fileutils.h>
@@ -175,7 +176,7 @@ auto Window::update() -> void {
     bar_.window.get_style_context()->remove_class("solo");
     bar_.window.get_style_context()->remove_class("empty");
   }
-  label_.set_markup(fmt::format(format_, fmt::arg("title", rewriteTitle(window_)),
+  label_.set_markup(fmt::format(format_, fmt::arg("title", waybar::util::rewriteTitle(window_, config_["rewrite"])),
                                 fmt::arg("app_id", app_id_), fmt::arg("shell", shell_)));
   if (tooltipEnabled()) {
     label_.set_tooltip_text(window_);
@@ -262,30 +263,4 @@ void Window::getTree() {
   }
 }
 
-std::string Window::rewriteTitle(const std::string& title) {
-  const auto& rules = config_["rewrite"];
-  if (!rules.isObject()) {
-    return title;
-  }
-
-  std::string res = title;
-
-  for (auto it = rules.begin(); it != rules.end(); ++it) {
-    if (it.key().isString() && it->isString()) {
-      try {
-        // malformated regexes will cause an exception.
-        // in this case, log error and try the next rule.
-        const std::regex rule{it.key().asString()};
-        if (std::regex_match(title, rule)) {
-          res = std::regex_replace(res, rule, it->asString());
-        }
-      } catch (const std::regex_error& e) {
-        spdlog::error("Invalid rule {}: {}", it.key().asString(), e.what());
-      }
-    }
-  }
-
-  return res;
-}
-
 }  // namespace waybar::modules::sway
diff --git a/src/util/rewrite_title.cpp b/src/util/rewrite_title.cpp
new file mode 100644
index 00000000..fae59bb1
--- /dev/null
+++ b/src/util/rewrite_title.cpp
@@ -0,0 +1,32 @@
+#include "util/rewrite_title.hpp"
+
+#include <spdlog/spdlog.h>
+
+#include <regex>
+
+namespace waybar::util {
+std::string rewriteTitle(const std::string& title, const Json::Value& rules) {
+  if (!rules.isObject()) {
+    return title;
+  }
+
+  std::string res = title;
+
+  for (auto it = rules.begin(); it != rules.end(); ++it) {
+    if (it.key().isString() && it->isString()) {
+      try {
+        // malformated regexes will cause an exception.
+        // in this case, log error and try the next rule.
+        const std::regex rule{it.key().asString()};
+        if (std::regex_match(title, rule)) {
+          res = std::regex_replace(res, rule, it->asString());
+        }
+      } catch (const std::regex_error& e) {
+        spdlog::error("Invalid rule {}: {}", it.key().asString(), e.what());
+      }
+    }
+  }
+
+  return res;
+}
+}  // namespace waybar::util