diff --git a/main.h b/main.h
index 523e3191..d8159677 100644
--- a/main.h
+++ b/main.h
@@ -62,6 +62,7 @@ using std::cout;
 using std::cerr;
 using std::endl;
 
+#include <limits.h>
 #ifndef PATH_MAX
 #define PATH_MAX	1024
 #warning PATH_MAX is undefined