diff --git a/lib/sockunion.c b/lib/sockunion.c
index e4b311c..039da1a 100644
--- a/lib/sockunion.c
+++ b/lib/sockunion.c
@@ -557,7 +557,7 @@
 sockunion_getsockname (int fd)
 {
   int ret;
-  int len;
+  socklen_t len;
   union
   {
     struct sockaddr sa;
@@ -612,7 +612,7 @@
 sockunion_getpeername (int fd)
 {
   int ret;
-  int len;
+  socklen_t len;
   union
   {
     struct sockaddr sa;