diff --git a/src/cardreader.h b/src/cardreader.h
index f643314..77524dc 100644
--- a/src/cardreader.h
+++ b/src/cardreader.h
@@ -11,6 +11,10 @@
 #include <winscard.h>
 #endif
 
+#ifdef _WIN32
+#define MAX_ATR_SIZE 33
+#endif
+
 static v8::Persistent<v8::String> name_symbol;
 static v8::Persistent<v8::String> connected_symbol;
 
diff --git a/src/common.h b/src/common.h
index 75f5a42..3666aa9 100644
--- a/src/common.h
+++ b/src/common.h
@@ -3,7 +3,26 @@
 
 #define ERR_MSG_MAX_LEN 512
 
+#ifdef _WIN32
+#include <windows.h>
+#else
+#include <unistd.h>
+#define Sleep(x) usleep((x)*1000)
+#endif
+
+#ifdef _WIN32
+#define snprintf _snprintf
+#endif
+
 namespace {
+
+#ifdef _WIN32
+
+    const char *pcsc_stringify_error(const LONG) {
+        return "";
+    }
+#endif
+
     std::string error_msg(const char* method, LONG result) {
         char msg[ERR_MSG_MAX_LEN];
         snprintf(msg,
diff --git a/src/pcsclite.cpp b/src/pcsclite.cpp
index 173fe38..e6abf87 100644
--- a/src/pcsclite.cpp
+++ b/src/pcsclite.cpp
@@ -1,4 +1,3 @@
-#include <unistd.h>
 #include "pcsclite.h"
 #include "common.h"
 
@@ -193,7 +192,7 @@ void PCSCLite::HandlerFunction(void* arg) {
             uv_mutex_unlock(&pcsclite->m_mutex);
         } else {
             /*  If PnP is not supported, just wait for 1 second */
-            sleep(1);
+            Sleep(1000);
         }
     }