diff --git a/libc/isystem/langinfo.h b/libc/isystem/langinfo.h
index 4f4c7361a..333daa44d 100644
--- a/libc/isystem/langinfo.h
+++ b/libc/isystem/langinfo.h
@@ -1,5 +1,5 @@
 #ifndef COSMOPOLITAN_LIBC_ISYSTEM_LANGINFO_H_
 #define COSMOPOLITAN_LIBC_ISYSTEM_LANGINFO_H_
 #include "libc/str/langinfo.h"
-
+#include "libc/str/nltypes.h"
 #endif /* COSMOPOLITAN_LIBC_ISYSTEM_LANGINFO_H_ */