diff --git a/src/common/string_util.cpp b/src/common/string_util.cpp
index 7dc0ba7ba..2e80809ab 100644
--- a/src/common/string_util.cpp
+++ b/src/common/string_util.cpp
@@ -2,9 +2,13 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
-#include <boost/range/algorithm.hpp>
+#include <cctype>
+#include <cerrno>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <boost/range/algorithm/transform.hpp>
 
-#include "common/common_funcs.h"
 #include "common/common_paths.h"
 #include "common/logging/log.h"
 #include "common/string_util.h"
@@ -12,6 +16,7 @@
 #ifdef _MSC_VER
     #include <Windows.h>
     #include <codecvt>
+    #include "common/common_funcs.h"
 #else
     #include <iconv.h>
 #endif
diff --git a/src/common/string_util.h b/src/common/string_util.h
index fdc410499..c5c474c6f 100644
--- a/src/common/string_util.h
+++ b/src/common/string_util.h
@@ -5,9 +5,10 @@
 #pragma once
 
 #include <cstdarg>
+#include <cstddef>
 #include <iomanip>
-#include <string>
 #include <sstream>
+#include <string>
 #include <vector>
 
 #include "common/common_types.h"