diff --git a/test/test_neighbor.cpp b/test/test_neighbor.cpp
index 6b14912..0f0abc4 100644
--- a/test/test_neighbor.cpp
+++ b/test/test_neighbor.cpp
@@ -71,9 +71,10 @@
     msg.ndm_state = NUD_REACHABLE;
     ether_addr mac = {{0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa}};
     rtattr lladdr{};
-    lladdr.rta_len = RTA_LENGTH(sizeof(mac));
+    constexpr size_t len = RTA_LENGTH(sizeof(mac));
+    lladdr.rta_len = len;
     lladdr.rta_type = NDA_LLADDR;
-    char lladdrbuf[RTA_ALIGN(lladdr.rta_len)];
+    char lladdrbuf[RTA_ALIGN(len)];
     std::memset(lladdrbuf, '\0', sizeof(lladdrbuf));
     std::memcpy(lladdrbuf, &lladdr, sizeof(lladdr));
     std::memcpy(RTA_DATA(lladdrbuf), &mac, sizeof(mac));
@@ -99,9 +100,10 @@
     in_addr addr;
     ASSERT_EQ(1, inet_pton(msg.ndm_family, "192.168.10.1", &addr));
     rtattr dst{};
-    dst.rta_len = RTA_LENGTH(sizeof(addr));
+    constexpr size_t len = RTA_LENGTH(sizeof(addr));
+    dst.rta_len = len;
     dst.rta_type = NDA_DST;
-    char dstbuf[RTA_ALIGN(dst.rta_len)];
+    char dstbuf[RTA_ALIGN(len)];
     std::memset(dstbuf, '\0', sizeof(dstbuf));
     std::memcpy(dstbuf, &dst, sizeof(dst));
     std::memcpy(RTA_DATA(dstbuf), &addr, sizeof(addr));
@@ -131,9 +133,10 @@
     in_addr addr;
     ASSERT_EQ(1, inet_pton(msg.ndm_family, "192.168.10.1", &addr));
     rtattr dst{};
-    dst.rta_len = RTA_LENGTH(sizeof(addr));
+    constexpr size_t len = RTA_LENGTH(sizeof(addr));
+    dst.rta_len = len;
     dst.rta_type = NDA_DST;
-    char dstbuf[RTA_ALIGN(dst.rta_len)];
+    char dstbuf[RTA_ALIGN(len)];
     std::memset(dstbuf, '\0', sizeof(dstbuf));
     std::memcpy(dstbuf, &dst, sizeof(dst));
     std::memcpy(RTA_DATA(dstbuf), &addr, sizeof(addr));
@@ -167,9 +170,10 @@
     in_addr addr;
     ASSERT_EQ(1, inet_pton(msg.ndm_family, "192.168.10.1", &addr));
     rtattr dst{};
-    dst.rta_len = RTA_LENGTH(sizeof(addr));
+    constexpr size_t len = RTA_LENGTH(sizeof(addr));
+    dst.rta_len = len;
     dst.rta_type = NDA_DST;
-    char dstbuf[RTA_ALIGN(dst.rta_len)];
+    char dstbuf[RTA_ALIGN(len)];
     std::memset(dstbuf, '\0', sizeof(dstbuf));
     std::memcpy(dstbuf, &dst, sizeof(dst));
     std::memcpy(RTA_DATA(dstbuf), &addr, sizeof(addr));
@@ -202,18 +206,20 @@
     msg.ndm_ifindex = 1;
     ether_addr mac = {{0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa}};
     rtattr lladdr{};
-    lladdr.rta_len = RTA_LENGTH(sizeof(mac));
+    constexpr size_t lladdr_len = RTA_LENGTH(sizeof(mac));
+    lladdr.rta_len = lladdr_len;
     lladdr.rta_type = NDA_LLADDR;
-    char lladdrbuf[RTA_ALIGN(lladdr.rta_len)];
+    char lladdrbuf[RTA_ALIGN(lladdr_len)];
     std::memset(lladdrbuf, '\0', sizeof(lladdrbuf));
     std::memcpy(lladdrbuf, &lladdr, sizeof(lladdr));
     std::memcpy(RTA_DATA(lladdrbuf), &mac, sizeof(mac));
     in6_addr addr;
     ASSERT_EQ(1, inet_pton(msg.ndm_family, "fd00::1", &addr));
     rtattr dst{};
-    dst.rta_len = RTA_LENGTH(sizeof(addr));
+    constexpr size_t dst_len = RTA_LENGTH(sizeof(addr));
+    dst.rta_len = dst_len;
     dst.rta_type = NDA_DST;
-    char dstbuf[RTA_ALIGN(dst.rta_len)];
+    char dstbuf[RTA_ALIGN(dst_len)];
     std::memset(dstbuf, '\0', sizeof(dstbuf));
     std::memcpy(dstbuf, &dst, sizeof(dst));
     std::memcpy(RTA_DATA(dstbuf), &addr, sizeof(addr));
diff --git a/test/test_netlink.cpp b/test/test_netlink.cpp
index 6e5a198..b3538f2 100644
--- a/test/test_netlink.cpp
+++ b/test/test_netlink.cpp
@@ -86,9 +86,10 @@
 {
     nlmsgerr ack{};
     nlmsghdr hdr{};
-    hdr.nlmsg_len = NLMSG_LENGTH(sizeof(ack));
+    constexpr size_t len = NLMSG_LENGTH(sizeof(ack));
+    hdr.nlmsg_len = len;
     hdr.nlmsg_type = NLMSG_ERROR;
-    char buf[NLMSG_ALIGN(hdr.nlmsg_len)];
+    char buf[NLMSG_ALIGN(len)];
     std::memcpy(buf, &hdr, sizeof(hdr));
     std::memcpy(NLMSG_DATA(buf), &ack, sizeof(ack));
     std::string_view data(reinterpret_cast<char*>(&buf), sizeof(buf));
@@ -107,9 +108,10 @@
     nlmsgerr err{};
     err.error = EINVAL;
     nlmsghdr hdr{};
-    hdr.nlmsg_len = NLMSG_LENGTH(sizeof(err));
+    constexpr size_t len = NLMSG_LENGTH(sizeof(err));
+    hdr.nlmsg_len = len;
     hdr.nlmsg_type = NLMSG_ERROR;
-    char buf[NLMSG_ALIGN(hdr.nlmsg_len)];
+    char buf[NLMSG_ALIGN(len)];
     std::memcpy(buf, &hdr, sizeof(hdr));
     std::memcpy(NLMSG_DATA(buf), &err, sizeof(err));
     std::string_view data(reinterpret_cast<char*>(&buf), sizeof(buf));