diff --git a/sysdeps/unix/sysv/linux/alpha/bits/types.h b/sysdeps/unix/sysv/linux/alpha/bits/types.h
index 6a1e846263..d71599cb32 100644
--- a/sysdeps/unix/sysv/linux/alpha/bits/types.h
+++ b/sysdeps/unix/sysv/linux/alpha/bits/types.h
@@ -106,8 +106,10 @@ typedef struct
        from the user namespace.  */
 #ifdef __USE_XOPEN
     __fd_mask fds_bits[__FD_SETSIZE / __NFDBITS];
+# define __FDS_BITS(set) ((set)->fds_bits)
 #else
     __fd_mask __fds_bits[__FD_SETSIZE / __NFDBITS];
+# define __FDS_BITS(set) ((set)->__fds_bits)
 #endif
   } __fd_set;
 
diff --git a/sysdeps/unix/sysv/linux/mips/bits/types.h b/sysdeps/unix/sysv/linux/mips/bits/types.h
index 6629366c30..36a1e0e0e3 100644
--- a/sysdeps/unix/sysv/linux/mips/bits/types.h
+++ b/sysdeps/unix/sysv/linux/mips/bits/types.h
@@ -103,8 +103,10 @@ typedef struct
        from the user namespace.  */
 #ifdef __USE_XOPEN
     __fd_mask fds_bits[__FD_SETSIZE / __NFDBITS];
+# define __FDS_BITS(set) ((set)->fds_bits)
 #else
     __fd_mask __fds_bits[__FD_SETSIZE / __NFDBITS];
+# define __FDS_BITS(set) ((set)->__fds_bits)
 #endif
   } __fd_set;
 
diff --git a/sysdeps/unix/sysv/sysv4/solaris2/bits/types.h b/sysdeps/unix/sysv/sysv4/solaris2/bits/types.h
index aa73ebcb19..aeba05b7b3 100644
--- a/sysdeps/unix/sysv/sysv4/solaris2/bits/types.h
+++ b/sysdeps/unix/sysv/sysv4/solaris2/bits/types.h
@@ -94,8 +94,10 @@ typedef struct
        from the user namespace.  */
 #ifdef __USE_XOPEN
     unsigned long int fds_bits[(__FD_SETSIZE + (__NFDBITS - 1)) / __NFDBITS];
+# define __FDS_BITS(set) ((set)->fds_bits)
 #else
     unsigned long int __fds_bits[(__FD_SETSIZE + (__NFDBITS - 1)) / __NFDBITS];
+# define __FDS_BITS(set) ((set)->__fds_bits)
 #endif
   } __fd_set;