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-rw-r--r--crypto/des/destest.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/crypto/des/destest.c b/crypto/des/destest.c
index 0054fb9a97..d92fabdf3f 100644
--- a/crypto/des/destest.c
+++ b/crypto/des/destest.c
@@ -66,7 +66,8 @@
#include <stdlib.h>
#ifndef MSDOS
#if !defined(VMS) || defined(__DECC)
-#include <unistd.h>
+#include <openssl/opensslconf.h>
+#include OPENSSL_UNISTD
#endif /* VMS */
#else
#include <io.h>