diff --git a/src/tcp_address.cpp b/src/tcp_address.cpp
index 507fbc66..8a6eedbc 100644
--- a/src/tcp_address.cpp
+++ b/src/tcp_address.cpp
@@ -136,10 +136,10 @@ int zmq::tcp_address_t::resolve_nic_name (const char *nic_, bool ipv6_, bool is_
     }
     if (is_src_)
         memcpy (&source_address.ipv4.sin_addr,
-            &((sockaddr_in*) &ifr.ifr_addr)->sin_addr, sizeof in_addr);
+            &((sockaddr_in*) &ifr.ifr_addr)->sin_addr, sizeof (struct in_addr));
     else
        memcpy (&address.ipv4.sin_addr,
-            &((sockaddr_in*) &ifr.ifr_addr)->sin_addr, sizeof in_addr);
+            &((sockaddr_in*) &ifr.ifr_addr)->sin_addr, sizeof (struct in_addr));
 
     return 0;
 }
diff --git a/tests/test_filter_ipc.cpp b/tests/test_filter_ipc.cpp
index 6a3b8a76..00518f71 100644
--- a/tests/test_filter_ipc.cpp
+++ b/tests/test_filter_ipc.cpp
@@ -122,7 +122,7 @@ int main (void)
     // Get the group and supplimental groups of the process owner
     gid_t groups[100];
     int ngroups = getgroups(100, groups);
-    assert (ngroups != -1);
+    assert (ngroups != -1 && ngroups != 0);
     gid_t group = getgid(), supgroup = groups[0], notgroup = groups[ngroups - 1] + 1;
     for (int i = 0; i < ngroups; i++) {
         if (supgroup == group && group != groups[i])