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-rw-r--r--ext/openssl/ossl.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/ext/openssl/ossl.h b/ext/openssl/ossl.h
index cf393d4a67..b112aebf10 100644
--- a/ext/openssl/ossl.h
+++ b/ext/openssl/ossl.h
@@ -46,7 +46,9 @@ extern "C" {
#if defined(_WIN32)
# define OSSL_NO_CONF_API 1
-# define OPENSSL_SYS_WIN32 1
+# if !defined(OPENSSL_SYS_WIN32)
+# define OPENSSL_SYS_WIN32 1
+# endif
# include <winsock2.h>
#endif
#include <errno.h>