diff --git a/src/afs/SOLARIS/osi_file.c b/src/afs/SOLARIS/osi_file.c
index 24d1e6a3ec..2df465bba1 100644
--- a/src/afs/SOLARIS/osi_file.c
+++ b/src/afs/SOLARIS/osi_file.c
@@ -148,7 +148,11 @@ void *osi_VxfsOpen(afs_int32 ainode)
 }
 #endif /* AFS_HAVE_VXFS */
 
+#if defined(AFS_SUN57_64BIT_ENV)
+void *osi_UfsOpen(ino_t ainode)
+#else
 void *osi_UfsOpen(afs_int32 ainode)
+#endif
 {
     struct inode *ip;
     register struct osi_file *afile = NULL;