diff --git a/blahtexml/Source/main.cpp b/blahtexml/Source/main.cpp

index f07aa0e..c6f77a4 100644

--- a/blahtexml/Source/main.cpp

+++ b/blahtexml/Source/main.cpp

@@ -22,6 +22,7 @@ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND

 #include <iostream>

 #include <stdio.h>

 #include <stdlib.h>

+#include <unistd.h>

 #include <sstream>

 #include <stdexcept>

diff --git a/blahtexml/Source/mainPng.cpp b/blahtexml/Source/mainPng.cpp

index 5183d1b..4be5a31 100644

--- a/blahtexml/Source/mainPng.cpp

+++ b/blahtexml/Source/mainPng.cpp

@@ -27,7 +27,7 @@ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND

 #include <stdio.h>

 #include <stdlib.h>

 #include <sstream>

-

+#include <unistd.h>

 using namespace std;

 using namespace blahtex;