diff --git a/src/interfaces/libpq/fe-lobj.c b/src/interfaces/libpq/fe-lobj.c
index 6eaec4aacdd..ad0bd351094 100644
--- a/src/interfaces/libpq/fe-lobj.c
+++ b/src/interfaces/libpq/fe-lobj.c
@@ -290,7 +290,7 @@ lo_read(PGconn *conn, int fd, char *buf, size_t len)
 	argv[1].u.integer = (int) len;
 
 	res = PQfn(conn, conn->lobjfuncs->fn_lo_read,
-			   (int *) buf, &result_len, 0, argv, 2);
+			   (void *) buf, &result_len, 0, argv, 2);
 	if (PQresultStatus(res) == PGRES_COMMAND_OK)
 	{
 		PQclear(res);
@@ -441,8 +441,8 @@ lo_lseek64(PGconn *conn, int fd, pg_int64 offset, int whence)
 	argv[2].u.integer = whence;
 
 	res = PQfn(conn, conn->lobjfuncs->fn_lo_lseek64,
-			   (int *) &retval, &result_len, 0, argv, 3);
-	if (PQresultStatus(res) == PGRES_COMMAND_OK)
+			   (void *) &retval, &result_len, 0, argv, 3);
+	if (PQresultStatus(res) == PGRES_COMMAND_OK && result_len == 8)
 	{
 		PQclear(res);
 		return lo_ntoh64(retval);
@@ -607,8 +607,8 @@ lo_tell64(PGconn *conn, int fd)
 	argv[0].u.integer = fd;
 
 	res = PQfn(conn, conn->lobjfuncs->fn_lo_tell64,
-			   (int *) &retval, &result_len, 0, argv, 1);
-	if (PQresultStatus(res) == PGRES_COMMAND_OK)
+			   (void *) &retval, &result_len, 0, argv, 1);
+	if (PQresultStatus(res) == PGRES_COMMAND_OK && result_len == 8)
 	{
 		PQclear(res);
 		return lo_ntoh64(retval);