diff --git a/libnfc/chips/pn53x.c b/libnfc/chips/pn53x.c
index 4d87474..ebb3555 100644
--- a/libnfc/chips/pn53x.c
+++ b/libnfc/chips/pn53x.c
@@ -38,6 +38,13 @@
 #include "pn53x.h"
 #include "../mirror-subr.h"
 
+#ifdef _WIN32
+  #include <windows.h>
+
+  #define strdup _strdup
+  #define snprintf sprintf_s
+#endif
+
 // PN53X configuration
 const byte_t pncmd_get_firmware_version       [  2] = { 0xD4,0x02 };
 const byte_t pncmd_get_general_status         [  2] = { 0xD4,0x04 };
diff --git a/libnfc/nfc.c b/libnfc/nfc.c
index 60804c3..3d30165 100644
--- a/libnfc/nfc.c
+++ b/libnfc/nfc.c
@@ -36,7 +36,6 @@
 #ifdef _WIN32
   #include <windows.h>
 
-  #define strdup _strdup
   #define snprintf sprintf_s
 #endif