diff --git a/src/cfgparse.c b/src/cfgparse.c
index 7b51024..392a2bd 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -133,20 +133,6 @@
 		if (!ss2)
 			goto fail;
 
-		if (ss2->ss_family == AF_CUST_SOCKPAIR) {
-			socklen_t addr_len;
-
-			fd = ((struct sockaddr_in *)ss2)->sin_addr.s_addr;
-			addr_len = sizeof(*ss2);
-			if (getsockname(fd, (struct sockaddr *)ss2, &addr_len) == -1) {
-				memprintf(err, "cannot use file descriptor '%d' : %s.\n", fd, strerror(errno));
-				goto fail;
-			}
-
-			ss2->ss_family = AF_CUST_SOCKPAIR; /* reassign AF_CUST_SOCKPAIR because of getsockname */
-			port = end = 0;
-		}
-
 		/* OK the address looks correct */
 		if (!create_listeners(bind_conf, ss2, port, end, fd, err)) {
 			memprintf(err, "%s for address '%s'.\n", *err, str);
diff --git a/src/tools.c b/src/tools.c
index db17fda..e543fd6 100644
--- a/src/tools.c
+++ b/src/tools.c
@@ -943,6 +943,8 @@
 		ss.ss_family = AF_UNSPEC;
 
 	if (ss.ss_family == AF_CUST_SOCKPAIR) {
+		struct sockaddr_storage ss2;
+		socklen_t addr_len;
 		char *endptr;
 
 		new_fd = strtol(str2, &endptr, 10);
@@ -951,6 +953,13 @@
 			goto out;
 		}
 
+		/* just verify that it's a socket */
+		addr_len = sizeof(ss2);
+		if (getsockname(new_fd, (struct sockaddr *)&ss2, &addr_len) == -1) {
+			memprintf(err, "cannot use file descriptor '%d' : %s.\n", new_fd, strerror(errno));
+			goto out;
+		}
+
 		((struct sockaddr_in *)&ss)->sin_addr.s_addr = new_fd;
 		((struct sockaddr_in *)&ss)->sin_port = 0;
 	}