diff --git a/ofstd/libsrc/ofchrenc.cc b/ofstd/libsrc/ofchrenc.cc
index 4bc0ed598..4cac31beb 100644
--- a/ofstd/libsrc/ofchrenc.cc
+++ b/ofstd/libsrc/ofchrenc.cc
@@ -19,7 +19,6 @@
  *
  */
 
-
 #include "dcmtk/config/osconfig.h"
 
 #include "dcmtk/ofstd/ofchrenc.h"
@@ -27,6 +26,8 @@
 #include "dcmtk/ofstd/ofdiag.h"
 #include "dcmtk/ofstd/ofconsol.h"
 
+#include <cerrno>
+
 #ifdef HAVE_WINDOWS_H
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>