diff --git a/tests/socket/socket_test.c b/tests/socket/socket_test.c
index a2e103c..5cf20b7 100644
--- a/tests/socket/socket_test.c
+++ b/tests/socket/socket_test.c
@@ -24,6 +24,7 @@
 #include <string.h>
 #include <fcntl.h>
 #include <inttypes.h>
+#include <errno.h>
 
 #include <sys/socket.h>
 #include <arpa/inet.h>
@@ -143,6 +144,11 @@
 			     OSMO_SOCK_F_BIND|OSMO_SOCK_F_CONNECT);
 	OSMO_ASSERT(fd >= 0);
 
+	printf("Checking osmo_sock_init2(AF_UNSPEC) BIND on IPv4\n");
+	fd = osmo_sock_init2(AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, "127.0.0.1", 0, NULL, 0,
+			     OSMO_SOCK_F_BIND);
+	OSMO_ASSERT(fd == -ENODEV); /* BUG! */
+
 	talloc_free(name);
 
 	return 0;
diff --git a/tests/socket/socket_test.err b/tests/socket/socket_test.err
index 0f0f8da..37504e7 100644
--- a/tests/socket/socket_test.err
+++ b/tests/socket/socket_test.err
@@ -2,3 +2,4 @@
 invalid: you have to specify either BIND or CONNECT flags
 Unable to find a common protocol (IPv4 or IPv6) for local host: 127.0.0.1 and remote host: ::1.
 Unable to find a common protocol (IPv4 or IPv6) for local host: ::1 and remote host: 127.0.0.1.
+Unable to find a common protocol (IPv4 or IPv6) for local host: 127.0.0.1 and remote host: (null).
diff --git a/tests/socket/socket_test.ok b/tests/socket/socket_test.ok
index 4265be8..696e356 100644
--- a/tests/socket/socket_test.ok
+++ b/tests/socket/socket_test.ok
@@ -9,3 +9,4 @@
 Checking osmo_sock_init2(AF_UNSPEC) must fail on mixed IPv6 & IPv4
 Checking osmo_sock_init2(AF_UNSPEC) BIND + CONNECT on IPv4
 Checking osmo_sock_init2(AF_UNSPEC) BIND + CONNECT on IPv6
+Checking osmo_sock_init2(AF_UNSPEC) BIND on IPv4