diff --git a/support/nfs/getport.c b/support/nfs/getport.c
index 47824a2..f5f7049 100644
--- a/support/nfs/getport.c
+++ b/support/nfs/getport.c
@@ -836,7 +836,7 @@ unsigned short nfs_getlocalport(const rpcprot_t program,
 {
 	struct sockaddr_storage address;
 	struct sockaddr *lb_addr = (struct sockaddr *)&address;
-	socklen_t lb_len = sizeof(lb_addr);
+	socklen_t lb_len = sizeof(*lb_addr);
 	unsigned short port = 0;
 
 #ifdef NFS_GP_LOCAL