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-rw-r--r--crypto/comp/c_zlib.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/crypto/comp/c_zlib.c b/crypto/comp/c_zlib.c
index 171fa5b86b..8263f7315d 100644
--- a/crypto/comp/c_zlib.c
+++ b/crypto/comp/c_zlib.c
@@ -73,7 +73,9 @@ static COMP_METHOD zlib_stateful_method={
# include <windows.h>
# define Z_CALLCONV _stdcall
-# define ZLIB_SHARED
+# ifndef ZLIB_SHARED
+# define ZLIB_SHARED
+# endif
#else
# define Z_CALLCONV
#endif /* !(OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32) */