diff --git a/CGAL_ImageIO/src/CGAL_ImageIO/analyze_impl.h b/CGAL_ImageIO/src/CGAL_ImageIO/analyze_impl.h
index 10d082bbaa2..21520f5a5c9 100644
--- a/CGAL_ImageIO/src/CGAL_ImageIO/analyze_impl.h
+++ b/CGAL_ImageIO/src/CGAL_ImageIO/analyze_impl.h
@@ -52,6 +52,8 @@
 #define DT_RGB                  128 /* */
 #define DT_ALL                  255 /* */
 
+#include <cstring>
+
 struct header_key                       /*      header_key       */
     {                                           /* off + size*/
         int sizeof_hdr;                         /* 0 + 4     */
diff --git a/CGAL_ImageIO/src/CGAL_ImageIO/bmpendian.h b/CGAL_ImageIO/src/CGAL_ImageIO/bmpendian.h
index 40cf71ef279..36cdace7bb3 100644
--- a/CGAL_ImageIO/src/CGAL_ImageIO/bmpendian.h
+++ b/CGAL_ImageIO/src/CGAL_ImageIO/bmpendian.h
@@ -32,6 +32,7 @@
 #ifndef __ENDIAN_H_INCLUDED__
 #define __ENDIAN_H_INCLUDED__
 
+#include <cstdio>
 #include "bmptypes.h"
 
 /*