diff --git a/src/win/util.c b/src/win/util.c
index b7dba7bb..0bcb721a 100644
--- a/src/win/util.c
+++ b/src/win/util.c
@@ -1037,7 +1037,8 @@ int uv_interface_addresses(uv_interface_address_t** addresses_ptr,
 
       /* XP has no OnLinkPrefixLength field. */
       if (is_vista_or_greater) {
-        prefix_len = unicast_address->OnLinkPrefixLength;
+        prefix_len =
+          ((IP_ADAPTER_UNICAST_ADDRESS_LH*) unicast_address)->OnLinkPrefixLength;
       } else {
         /* Prior to Windows Vista the FirstPrefix pointed to the list with
          * single prefix for each IP address assigned to the adapter.
diff --git a/src/win/winsock.h b/src/win/winsock.h
index 957d08ec..7c007ab4 100644
--- a/src/win/winsock.h
+++ b/src/win/winsock.h
@@ -166,6 +166,25 @@ typedef struct _IP_ADAPTER_UNICAST_ADDRESS_XP {
   ULONG LeaseLifetime;
 } IP_ADAPTER_UNICAST_ADDRESS_XP,*PIP_ADAPTER_UNICAST_ADDRESS_XP;
 
+typedef struct _IP_ADAPTER_UNICAST_ADDRESS_LH {
+  union {
+    ULONGLONG Alignment;
+    struct {
+      ULONG Length;
+      DWORD Flags;
+    };
+  };
+  struct _IP_ADAPTER_UNICAST_ADDRESS_LH *Next;
+  SOCKET_ADDRESS Address;
+  IP_PREFIX_ORIGIN PrefixOrigin;
+  IP_SUFFIX_ORIGIN SuffixOrigin;
+  IP_DAD_STATE DadState;
+  ULONG ValidLifetime;
+  ULONG PreferredLifetime;
+  ULONG LeaseLifetime;
+  UINT8 OnLinkPrefixLength;
+} IP_ADAPTER_UNICAST_ADDRESS_LH,*PIP_ADAPTER_UNICAST_ADDRESS_LH;
+
 #endif
 
 #endif /* UV_WIN_WINSOCK_H_ */