diff --git a/bfd/hosts/dgux.h b/bfd/hosts/dgux.h
index b4b102de50..57351c26c4 100644
--- a/bfd/hosts/dgux.h
+++ b/bfd/hosts/dgux.h
@@ -1,3 +1,4 @@
+#include <errno.h>
 #include <sys/dg_c_generics.h>
 #include <unistd.h>
 #include <stdlib.h>