diff --git a/include/util/string.hpp b/include/util/string.hpp
index d644b4c4..24a9b2b9 100644
--- a/include/util/string.hpp
+++ b/include/util/string.hpp
@@ -1,15 +1,17 @@
+#pragma once
+
 #include <string>
 
 const std::string WHITESPACE = " \n\r\t\f\v";
 
-std::string ltrim(const std::string s) {
+inline std::string ltrim(const std::string& s) {
   size_t begin = s.find_first_not_of(WHITESPACE);
   return (begin == std::string::npos) ? "" : s.substr(begin);
 }
 
-std::string rtrim(const std::string s) {
+inline std::string rtrim(const std::string& s) {
   size_t end = s.find_last_not_of(WHITESPACE);
   return (end == std::string::npos) ? "" : s.substr(0, end + 1);
 }
 
-std::string trim(const std::string& s) { return rtrim(ltrim(s)); }
+inline std::string trim(const std::string& s) { return rtrim(ltrim(s)); }
diff --git a/src/modules/wlr/taskbar.cpp b/src/modules/wlr/taskbar.cpp
index ddc360bb..55c9431e 100644
--- a/src/modules/wlr/taskbar.cpp
+++ b/src/modules/wlr/taskbar.cpp
@@ -4,6 +4,7 @@
 #include "glibmm/fileutils.h"
 #include "glibmm/refptr.h"
 #include "util/format.hpp"
+#include "util/string.hpp"
 
 #include <algorithm>
 #include <cctype>
@@ -26,27 +27,6 @@
 
 namespace waybar::modules::wlr {
 
-/* String manipulation methods */
-const std::string WHITESPACE = " \n\r\t\f\v";
-
-static std::string ltrim(const std::string& s)
-{
-    size_t start = s.find_first_not_of(WHITESPACE);
-    return (start == std::string::npos) ? "" : s.substr(start);
-}
-
-static std::string rtrim(const std::string& s)
-{
-    size_t end = s.find_last_not_of(WHITESPACE);
-    return (end == std::string::npos) ? "" : s.substr(0, end + 1);
-}
-
-static std::string trim(const std::string& s)
-{
-    return rtrim(ltrim(s));
-}
-
-
 /* Icon loading functions */
 static std::vector<std::string> search_prefix()
 {