diff --git a/src/frontend/com_shell.c b/src/frontend/com_shell.c
index 0763da687..625f9ed3f 100644
--- a/src/frontend/com_shell.c
+++ b/src/frontend/com_shell.c
@@ -8,7 +8,7 @@
 #include <wordlist.h>
 
 #include "com_shell.h"
-
+#include "cpextern.h"
 
 /* Fork a shell. */