diff --git a/frontend/line-ed/line-ed.c b/frontend/line-ed/line-ed.c
index 51c4d38..5adaeb8 100644
--- a/frontend/line-ed/line-ed.c
+++ b/frontend/line-ed/line-ed.c
@@ -10,6 +10,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <wchar.h>
+#include <wctype.h>
 
 #define LINE_ED_FROM_LEX_SOURCE(p)                                             \
 	((struct line_ed *)((char *)p - offsetof(struct line_ed, l_line_source)))