diff --git a/blaze822.h b/blaze822.h
index 434e23e..a375d3d 100644
--- a/blaze822.h
+++ b/blaze822.h
@@ -2,6 +2,11 @@
 
 #include <stdint.h>
 #include <time.h>
+#include <limits.h>
+
+#if !defined(PATH_MAX)
+#define PATH_MAX 4096
+#endif
 
 struct message;