diff --git a/ssh/compat.c b/ssh/compat.c
index 02f3f84..0126d00 100644
--- a/ssh/compat.c
+++ b/ssh/compat.c
@@ -208,7 +208,7 @@ compat_cipher_proposal(char *cipher_prop, u_int compat)
 	char *orig_prop, *fix_ciphers, *cp, *tmp;
 	size_t maxlen;
 
-	if (compat & SSH_BUG_BIGENDIANAES)
+	if (!(compat & SSH_BUG_BIGENDIANAES))
 		return cipher_prop;
 
 	tmp = orig_prop = strdup(cipher_prop);