1 files changed, 4 insertions, 0 deletions

diff --git a/gzguts.h b/gzguts.h
index 13e8179..ee3f281 100644
--- a/gzguts.h
+++ b/gzguts.h
@@ -27,6 +27,10 @@
 #endif
 #include <fcntl.h>
 
+#ifdef _WIN32
+#  include <stddef.h>
+#endif
+
 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
 #  include <io.h>
 #endif