diff --git a/src/Makefile.am b/src/Makefile.am
index 18b1cec..a29f607 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -54,7 +54,7 @@ libtirpc_la_SOURCES = auth_none.c auth_unix.c authunix_prot.c bindresvport.c cln
         auth_time.c auth_des.c authdes_prot.c debug.c
 
 ## XDR
-libtirpc_la_SOURCES += xdr.c xdr_rec.c xdr_array.c xdr_float.c xdr_mem.c xdr_reference.c xdr_stdio.c
+libtirpc_la_SOURCES += xdr.c xdr_rec.c xdr_array.c xdr_float.c xdr_mem.c xdr_reference.c xdr_stdio.c xdr_sizeof.c
 
 if SYMVERS
     libtirpc_la_LDFLAGS += -Wl,--version-script=$(srcdir)/libtirpc.map
diff --git a/src/libtirpc.map b/src/libtirpc.map
index 449b769..855d6b3 100644
--- a/src/libtirpc.map
+++ b/src/libtirpc.map
@@ -321,6 +321,7 @@ TIRPC_0.3.3 {
     __key_encryptsession_pk_LOCAL;
     __key_gendes_LOCAL;
     authdes_pk_create;
+    xdr_sizeof;
 } TIRPC_0.3.2;
 
 TIRPC_PRIVATE {
diff --git a/src/xdr_sizeof.c b/src/xdr_sizeof.c
index cc5414b..4ecc977 100644
--- a/src/xdr_sizeof.c
+++ b/src/xdr_sizeof.c
@@ -90,7 +90,7 @@ x_inline(xdrs, len)
 	if (xdrs->x_op != XDR_ENCODE) {
 		return (NULL);
 	}
-	if (len < (u_int)xdrs->x_base) {
+	if (len < (u_int) (long int) xdrs->x_base) {
 		/* x_private was already allocated */
 		xdrs->x_handy += len;
 		return ((int32_t *) xdrs->x_private);
@@ -102,7 +102,7 @@ x_inline(xdrs, len)
 			xdrs->x_base = 0;
 			return (NULL);
 		}
-		xdrs->x_base = (caddr_t) len;
+		xdrs->x_base = (void *) (long) len;
 		xdrs->x_handy += len;
 		return ((int32_t *) xdrs->x_private);
 	}
diff --git a/tirpc/rpc/xdr.h b/tirpc/rpc/xdr.h
index 64069ab..904e5bb 100644
--- a/tirpc/rpc/xdr.h
+++ b/tirpc/rpc/xdr.h
@@ -327,6 +327,7 @@ extern bool_t	xdr_hyper(XDR *, quad_t *);
 extern bool_t	xdr_u_hyper(XDR *, u_quad_t *);
 extern bool_t	xdr_longlong_t(XDR *, quad_t *);
 extern bool_t	xdr_u_longlong_t(XDR *, u_quad_t *);
+extern u_long     xdr_sizeof(xdrproc_t, void *);
 #ifdef __cplusplus
 }
 #endif