diff --git a/kicad/minizip/minizip.c b/kicad/minizip/minizip.c
index 23786b1b4c..974c117bfd 100644
--- a/kicad/minizip/minizip.c
+++ b/kicad/minizip/minizip.c
@@ -8,7 +8,7 @@
 #include <errno.h>
 #include <fcntl.h>
 
-#ifdef unix
+#ifndef WIN32
 # include <unistd.h>
 # include <utime.h>
 # include <sys/types.h>