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-rw-r--r--crypto/des/des_opts.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/crypto/des/des_opts.c b/crypto/des/des_opts.c
index 500509ea73..746c456f8f 100644
--- a/crypto/des/des_opts.c
+++ b/crypto/des/des_opts.c
@@ -65,7 +65,8 @@
#include <stdio.h>
#ifndef MSDOS
-#include <unistd.h>
+#include <openssl/e_os2.h>
+#include OPENSSL_UNISTD
#else
#include <io.h>
extern void exit();