diff --git a/src/config/ConfigManager.cpp b/src/config/ConfigManager.cpp
index 2df7955..6486410 100644
--- a/src/config/ConfigManager.cpp
+++ b/src/config/ConfigManager.cpp
@@ -3,6 +3,7 @@
 #include <filesystem>
 #include <glob.h>
 #include <cstring>
+#include <mutex>
 
 static Hyprlang::CParseResult handleSource(const char* c, const char* v) {
     const std::string      VALUE   = v;
@@ -211,4 +212,4 @@ std::optional<std::string> CConfigManager::handleSource(const std::string& comma
     }
 
     return {};
-}
\ No newline at end of file
+}