diff --git a/include/utils/process.hpp b/include/utils/process.hpp
index eb380532..72b21015 100644
--- a/include/utils/process.hpp
+++ b/include/utils/process.hpp
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <sys/types.h>
+
 #include "common.hpp"
 
 POLYBAR_NS