libyang BUGFIX cleanup of headers includes
diff --git a/src/xpath.h b/src/xpath.h
index 316f535..72858dd 100644
--- a/src/xpath.h
+++ b/src/xpath.h
@@ -16,6 +16,7 @@
 #define LY_XPATH_H
 
 #include <stdint.h>
+#include <stddef.h>
 
 #include "config.h"
 #include "log.h"