diff --git a/intern/locale/msgfmt.cc b/intern/locale/msgfmt.cc
index 312e4728973..17720adfa48 100644
--- a/intern/locale/msgfmt.cc
+++ b/intern/locale/msgfmt.cc
@@ -14,7 +14,9 @@
 // Usage: msgfmt input.po output.po
 
 #include <algorithm>
+#include <cctype>
 #include <fstream>
+#include <functional>
 #include <iostream>
 #include <map>
 #include <stdlib.h>