diff --git a/matrixssl/extDecode.c b/matrixssl/extDecode.c
index 7aac49f..3f124f1 100644
--- a/matrixssl/extDecode.c
+++ b/matrixssl/extDecode.c
@@ -693,7 +693,7 @@ static int dealWithAlpnExt(ssl_t *ssl, const unsigned char *c, unsigned short ex
 		that here for checking later (in choosing cipher suite, etc).
 		@see https://tools.ietf.org/html/rfc7540#section-9.2
 	*/
-	if ((ssl->alpnLen == 2) && memcmp(ssl->alpn, "h2", 2) = 0) {
+	if ((ssl->alpnLen == 2) && (memcmp(ssl->alpn, "h2", 2) == 0)) {
 		ssl->flags |= SSL_FLAGS_HTTP2;
 	}