diff --git a/tools/testing/selftests/net/bind_wildcard.c b/tools/testing/selftests/net/bind_wildcard.c
index a2662348cdb1..d65c3bb6ba13 100644
--- a/tools/testing/selftests/net/bind_wildcard.c
+++ b/tools/testing/selftests/net/bind_wildcard.c
@@ -6,7 +6,9 @@
 
 #include "../kselftest_harness.h"
 
-struct in6_addr in6addr_v4mapped_any = {
+static const __u32 in4addr_any = INADDR_ANY;
+static const __u32 in4addr_loopback = INADDR_LOOPBACK;
+static const struct in6_addr in6addr_v4mapped_any = {
 	.s6_addr = {
 		0, 0, 0, 0,
 		0, 0, 0, 0,
@@ -14,8 +16,7 @@ struct in6_addr in6addr_v4mapped_any = {
 		0, 0, 0, 0
 	}
 };
-
-struct in6_addr in6addr_v4mapped_loopback = {
+static const struct in6_addr in6addr_v4mapped_loopback = {
 	.s6_addr = {
 		0, 0, 0, 0,
 		0, 0, 0, 0,
@@ -26,82 +27,105 @@ struct in6_addr in6addr_v4mapped_loopback = {
 
 FIXTURE(bind_wildcard)
 {
-	struct sockaddr_in addr4;
-	struct sockaddr_in6 addr6;
+	socklen_t addrlen[2];
+	union {
+		struct sockaddr addr;
+		struct sockaddr_in addr4;
+		struct sockaddr_in6 addr6;
+	} addr[2];
 };
 
 FIXTURE_VARIANT(bind_wildcard)
 {
-	const __u32 addr4_const;
-	const struct in6_addr *addr6_const;
+	sa_family_t family[2];
+	const void *addr[2];
 	int expected_errno;
 };
 
 FIXTURE_VARIANT_ADD(bind_wildcard, v4_any_v6_any)
 {
-	.addr4_const = INADDR_ANY,
-	.addr6_const = &in6addr_any,
+	.family = {AF_INET, AF_INET6},
+	.addr = {&in4addr_any, &in6addr_any},
 	.expected_errno = EADDRINUSE,
 };
 
 FIXTURE_VARIANT_ADD(bind_wildcard, v4_any_v6_local)
 {
-	.addr4_const = INADDR_ANY,
-	.addr6_const = &in6addr_loopback,
+	.family = {AF_INET, AF_INET6},
+	.addr = {&in4addr_any, &in6addr_loopback},
 	.expected_errno = 0,
 };
 
 FIXTURE_VARIANT_ADD(bind_wildcard, v4_any_v6_v4mapped_any)
 {
-	.addr4_const = INADDR_ANY,
-	.addr6_const = &in6addr_v4mapped_any,
+	.family = {AF_INET, AF_INET6},
+	.addr = {&in4addr_any, &in6addr_v4mapped_any},
 	.expected_errno = EADDRINUSE,
 };
 
 FIXTURE_VARIANT_ADD(bind_wildcard, v4_any_v6_v4mapped_local)
 {
-	.addr4_const = INADDR_ANY,
-	.addr6_const = &in6addr_v4mapped_loopback,
+	.family = {AF_INET, AF_INET6},
+	.addr = {&in4addr_any, &in6addr_v4mapped_loopback},
 	.expected_errno = EADDRINUSE,
 };
 
 FIXTURE_VARIANT_ADD(bind_wildcard, v4_local_v6_any)
 {
-	.addr4_const = INADDR_LOOPBACK,
-	.addr6_const = &in6addr_any,
+	.family = {AF_INET, AF_INET6},
+	.addr = {&in4addr_loopback, &in6addr_any},
 	.expected_errno = EADDRINUSE,
 };
 
 FIXTURE_VARIANT_ADD(bind_wildcard, v4_local_v6_local)
 {
-	.addr4_const = INADDR_LOOPBACK,
-	.addr6_const = &in6addr_loopback,
+	.family = {AF_INET, AF_INET6},
+	.addr = {&in4addr_loopback, &in6addr_loopback},
 	.expected_errno = 0,
 };
 
 FIXTURE_VARIANT_ADD(bind_wildcard, v4_local_v6_v4mapped_any)
 {
-	.addr4_const = INADDR_LOOPBACK,
-	.addr6_const = &in6addr_v4mapped_any,
+	.family = {AF_INET, AF_INET6},
+	.addr = {&in4addr_loopback, &in6addr_v4mapped_any},
 	.expected_errno = EADDRINUSE,
 };
 
 FIXTURE_VARIANT_ADD(bind_wildcard, v4_local_v6_v4mapped_local)
 {
-	.addr4_const = INADDR_LOOPBACK,
-	.addr6_const = &in6addr_v4mapped_loopback,
+	.family = {AF_INET, AF_INET6},
+	.addr = {&in4addr_loopback, &in6addr_v4mapped_loopback},
 	.expected_errno = EADDRINUSE,
 };
 
+static void setup_addr(FIXTURE_DATA(bind_wildcard) *self, int i,
+		       int family, const void *addr_const)
+{
+	if (family == AF_INET) {
+		struct sockaddr_in *addr4 = &self->addr[i].addr4;
+		const __u32 *addr4_const = addr_const;
+
+		addr4->sin_family = AF_INET;
+		addr4->sin_port = htons(0);
+		addr4->sin_addr.s_addr = htonl(*addr4_const);
+
+		self->addrlen[i] = sizeof(struct sockaddr_in);
+	} else {
+		struct sockaddr_in6 *addr6 = &self->addr[i].addr6;
+		const struct in6_addr *addr6_const = addr_const;
+
+		addr6->sin6_family = AF_INET6;
+		addr6->sin6_port = htons(0);
+		addr6->sin6_addr = *addr6_const;
+
+		self->addrlen[i] = sizeof(struct sockaddr_in6);
+	}
+}
+
 FIXTURE_SETUP(bind_wildcard)
 {
-	self->addr4.sin_family = AF_INET;
-	self->addr4.sin_port = htons(0);
-	self->addr4.sin_addr.s_addr = htonl(variant->addr4_const);
-
-	self->addr6.sin6_family = AF_INET6;
-	self->addr6.sin6_port = htons(0);
-	self->addr6.sin6_addr = *variant->addr6_const;
+	setup_addr(self, 0, variant->family[0], variant->addr[0]);
+	setup_addr(self, 1, variant->family[1], variant->addr[1]);
 }
 
 FIXTURE_TEARDOWN(bind_wildcard)
@@ -146,15 +170,15 @@ void bind_sockets(struct __test_metadata *_metadata,
 TEST_F(bind_wildcard, v4_v6)
 {
 	bind_sockets(_metadata, self, variant->expected_errno,
-		     (struct sockaddr *)&self->addr4, sizeof(self->addr4),
-		     (struct sockaddr *)&self->addr6, sizeof(self->addr6));
+		     &self->addr[0].addr, self->addrlen[0],
+		     &self->addr[1].addr, self->addrlen[1]);
 }
 
 TEST_F(bind_wildcard, v6_v4)
 {
 	bind_sockets(_metadata, self, variant->expected_errno,
-		     (struct sockaddr *)&self->addr6, sizeof(self->addr6),
-		     (struct sockaddr *)&self->addr4, sizeof(self->addr4));
+		     &self->addr[1].addr, self->addrlen[1],
+		     &self->addr[0].addr, self->addrlen[0]);
 }
 
 TEST_HARNESS_MAIN