diff --git a/src/afs/SOLARIS/osi_vfsops.c b/src/afs/SOLARIS/osi_vfsops.c
index b30386a864..54751519e1 100644
--- a/src/afs/SOLARIS/osi_vfsops.c
+++ b/src/afs/SOLARIS/osi_vfsops.c
@@ -350,7 +350,11 @@ int (*ufs_igetp) ();
 void (*ufs_itimes_nolockp) ();
 
 int (*afs_orig_ioctl) (), (*afs_orig_ioctl32) ();
+#if AFS_SUN511_ENV
+int64_t (*afs_orig_setgroups) (), (*afs_orig_setgroups32) ();
+#else
 int (*afs_orig_setgroups) (), (*afs_orig_setgroups32) ();
+#endif
 
 #ifndef AFS_SUN510_ENV
 struct ill_s *ill_g_headp = 0;