diff --git a/wolfssl/openssl/bn.h b/wolfssl/openssl/bn.h
index 91a844413..4cad216e9 100644
--- a/wolfssl/openssl/bn.h
+++ b/wolfssl/openssl/bn.h
@@ -66,7 +66,7 @@ typedef struct WOLFSSL_BIGNUM {
     #endif
 #endif
 
-#define WOLFSSL_BN_RAND_TOP_ANY     -1
+#define WOLFSSL_BN_RAND_TOP_ANY     (-1)
 #define WOLFSSL_BN_RAND_TOP_ONE     0
 #define WOLFSSL_BN_RAND_TOP_TWO     1