diff --git a/src/btrie.cc b/src/btrie.cc
index e705b67..05de870 100644
--- a/src/btrie.cc
+++ b/src/btrie.cc
@@ -41,6 +41,11 @@
 // BITS should be either 32 or 128
 #define MAXBITS 128
 
+#ifndef _WIN32
+#  include <netinet/in.h>
+#  include <sys/socket.h>
+#endif
+
 typedef struct btrie_collapsed_node {
   struct btrie_collapsed_node *bit[2];
   void *data;
diff --git a/src/iptrie.cc b/src/iptrie.cc
index b44e918..fffaa20 100644
--- a/src/iptrie.cc
+++ b/src/iptrie.cc
@@ -37,6 +37,11 @@
 #include <node_object_wrap.h>
 #include <assert.h>
 
+#ifndef _WIN32
+#  include <netinet/in.h>
+#  include <sys/socket.h>
+#endif
+
 using namespace v8;
 using namespace node;