diff --git a/simgear/io/decode_binobj.cxx b/simgear/io/decode_binobj.cxx
index 3088393b..af2ae2b9 100644
--- a/simgear/io/decode_binobj.cxx
+++ b/simgear/io/decode_binobj.cxx
@@ -4,7 +4,10 @@
 
 #include <simgear/compiler.h>
 
+#ifndef _WIN32
 #include <unistd.h>
+#endif
+
 #include <iostream>
 #include <cstdlib>