diff --git a/src/os/darwin/darwin_sigar.c b/src/os/darwin/darwin_sigar.c
index f85b4ea5..562b157b 100644
--- a/src/os/darwin/darwin_sigar.c
+++ b/src/os/darwin/darwin_sigar.c
@@ -1589,6 +1589,8 @@ int sigar_net_interface_config_get(sigar_t *sigar, const char *name,
         }
     }
 
+    SIGAR_ZERO(ifconfig);
+
     iter.type = IFMSG_ITER_GET;
     iter.name = name;