diff --git a/src/unix/bsd-ifaddrs.c b/src/unix/bsd-ifaddrs.c
index 9825b1c4..4ce48200 100644
--- a/src/unix/bsd-ifaddrs.c
+++ b/src/unix/bsd-ifaddrs.c
@@ -119,14 +119,19 @@ int uv_interface_addresses(uv_interface_address_t** addresses, int* count) {
       continue;
 
     address = *addresses;
-    memset(address->phys_addr, 0, sizeof(address->phys_addr));
 
     for (i = 0; i < *count; i++) {
+#if defined(__CYGWIN__) || defined(__MSYS__)
+      memset(address->phys_addr, 0, sizeof(address->phys_addr));
+#else
       if (strcmp(address->name, ent->ifa_name) == 0) {
         struct sockaddr_dl* sa_addr;
         sa_addr = (struct sockaddr_dl*)(ent->ifa_addr);
         memcpy(address->phys_addr, LLADDR(sa_addr), sizeof(address->phys_addr));
+      } else {
+        memset(address->phys_addr, 0, sizeof(address->phys_addr));
       }
+#endif
       address++;
     }
   }
diff --git a/src/unix/linux-core.c b/src/unix/linux-core.c
index 75362eb7..be586af4 100644
--- a/src/unix/linux-core.c
+++ b/src/unix/linux-core.c
@@ -890,12 +890,13 @@ int uv_interface_addresses(uv_interface_address_t** addresses,
       continue;
 
     address = *addresses;
-    memset(address->phys_addr, 0, sizeof(address->phys_addr));
 
     for (i = 0; i < (*count); i++) {
       if (strcmp(address->name, ent->ifa_name) == 0) {
         sll = (struct sockaddr_ll*)ent->ifa_addr;
         memcpy(address->phys_addr, sll->sll_addr, sizeof(address->phys_addr));
+      } else {
+        memset(address->phys_addr, 0, sizeof(address->phys_addr));
       }
       address++;
     }