diff --git a/sysdeps/unix/sysv/sco3.2.4/direct.h b/sysdeps/unix/sysv/sco3.2.4/direct.h
index 350300eb22..b3eaa54c8b 100644
--- a/sysdeps/unix/sysv/sco3.2.4/direct.h
+++ b/sysdeps/unix/sysv/sco3.2.4/direct.h
@@ -9,5 +9,14 @@ struct direct
     short int d_pad;
     long int d_off;
     unsigned short int d_reclen;
-    char d_name[1];
+    char d_name[1];		/* Actually longer. */
   };
+
+#include <stddef.h>
+
+/* We calculate the length of the name by taking the length of the whole
+   `struct direct' record, subtracting the size of everything before the
+   name, and subtracting one for the terminating null.  */
+
+#define D_NAMLEN(d) \
+  ((d)->d_reclen - offsetof (struct direct, d_name) - 1)