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-rw-r--r--crypto/async/arch/async_posix.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/crypto/async/arch/async_posix.h b/crypto/async/arch/async_posix.h
index c247888b67..475b56faab 100644
--- a/crypto/async/arch/async_posix.h
+++ b/crypto/async/arch/async_posix.h
@@ -54,7 +54,7 @@
#define OPENSSL_ASYNC_ARCH_ASYNC_POSIX_H
#include <openssl/e_os2.h>
-#if defined(OPENSSL_SYS_UNIX) && defined(OPENSSL_THREADS)
+#if (defined(OPENSSL_SYS_UNIX) || defined(OPENSSL_SYS_CYGWIN)) && defined(OPENSSL_THREADS)
# include <unistd.h>