diff --git a/tests/ifaddrs_test.cpp b/tests/ifaddrs_test.cpp
index 67857cb..bbaaec3 100644
--- a/tests/ifaddrs_test.cpp
+++ b/tests/ifaddrs_test.cpp
@@ -18,6 +18,9 @@
 
 #include <ifaddrs.h>
 
+#include <linux/if_packet.h>
+#include <netinet/in.h>
+
 TEST(ifaddrs, freeifaddrs_null) {
   freeifaddrs(nullptr);
 }
@@ -28,11 +31,33 @@
   ASSERT_EQ(0, getifaddrs(&addrs));
   ASSERT_TRUE(addrs != nullptr);
 
-  bool saw_loopback = false;
+  // We can't say much about what network interfaces are available, but we can be pretty
+  // sure there's a loopback interface, and that it has IPv4, IPv6, and AF_PACKET entries.
+  ifaddrs* lo_inet4 = nullptr;
+  ifaddrs* lo_inet6 = nullptr;
+  ifaddrs* lo_packet = nullptr;
   for (ifaddrs* addr = addrs; addr != nullptr; addr = addr->ifa_next) {
-    if (addr->ifa_name && strcmp(addr->ifa_name, "lo") == 0) saw_loopback = true;
+    if (addr->ifa_name && strcmp(addr->ifa_name, "lo") == 0) {
+      if (addr->ifa_addr && addr->ifa_addr->sa_family == AF_INET) lo_inet4 = addr;
+      else if (addr->ifa_addr && addr->ifa_addr->sa_family == AF_INET6) lo_inet6 = addr;
+      else if (addr->ifa_addr && addr->ifa_addr->sa_family == AF_PACKET) lo_packet = addr;
+    }
   }
-  ASSERT_TRUE(saw_loopback);
+
+  // Does the IPv4 entry look right?
+  ASSERT_TRUE(lo_inet4 != nullptr);
+  const sockaddr_in* sa_inet4 = reinterpret_cast<const sockaddr_in*>(lo_inet4->ifa_addr);
+  ASSERT_TRUE(ntohl(sa_inet4->sin_addr.s_addr) == INADDR_LOOPBACK);
+
+  // Does the IPv6 entry look right?
+  ASSERT_TRUE(lo_inet6 != nullptr);
+  const sockaddr_in6* sa_inet6 = reinterpret_cast<const sockaddr_in6*>(lo_inet6->ifa_addr);
+  ASSERT_TRUE(IN6_IS_ADDR_LOOPBACK(&sa_inet6->sin6_addr));
+
+  // Does the AF_PACKET entry look right?
+  ASSERT_TRUE(lo_packet != nullptr);
+  const sockaddr_ll* sa_ll = reinterpret_cast<const sockaddr_ll*>(lo_packet->ifa_addr);
+  ASSERT_EQ(6, sa_ll->sll_halen);
 
   freeifaddrs(addrs);
 }