diff --git a/common.c b/common.c
index 436de6a4e..cf5a4aa56 100644
--- a/common.c
+++ b/common.c
@@ -13,6 +13,7 @@ parts of fish.
 #include <stdio.h>
 #include <dirent.h>
 #include <sys/types.h>
+#include <sys/ioctl.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include <wctype.h>