diff --git a/tools/TexturePacker/XBTFWriter.cpp b/tools/TexturePacker/XBTFWriter.cpp
index 78b47fe..2e75d96 100644
--- a/tools/TexturePacker/XBTFWriter.cpp
+++ b/tools/TexturePacker/XBTFWriter.cpp
@@ -22,6 +22,7 @@
 #include "XBTFWriter.h"
 #define __STDC_FORMAT_MACROS
 #include <inttypes.h>
+#include <unistd.h> /* for unlink() prototype */
 #include "guilib/XBTF.h"
 #include "utils/EndianSwap.h"
 #if !defined(__APPLE__) && !defined(__FreeBSD__)