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-rw-r--r--libguile/socket.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libguile/socket.c b/libguile/socket.c
index c0faae1aa..5b17a741a 100644
--- a/libguile/socket.c
+++ b/libguile/socket.c
@@ -64,7 +64,7 @@
#if defined (HAVE_UNIX_DOMAIN_SOCKETS) && !defined (SUN_LEN)
-#define SUN_LEN(ptr) ((size_t) (((struct sockaddr_un *) 0)->sun_path) \
+#define SUN_LEN(ptr) (offsetof (struct sockaddr_un, sun_path) \
+ strlen ((ptr)->sun_path))
#endif