diff --git a/include/rtc/description.hpp b/include/rtc/description.hpp
index b1afd3e3e..0727d87f7 100644
--- a/include/rtc/description.hpp
+++ b/include/rtc/description.hpp
@@ -29,7 +29,7 @@ const string DEFAULT_H264_VIDEO_PROFILE =
     "profile-level-id=42e01f;packetization-mode=1;level-asymmetry-allowed=1";
 
 struct CertificateFingerprint {
-	enum Algorithm { Sha1, Sha224, Sha256, Sha384, Sha512 };
+	enum class Algorithm { Sha1, Sha224, Sha256, Sha384, Sha512 };
 	static string AlgorithmIdentifier(Algorithm algorithm);
 	static size_t AlgorithmSize(Algorithm algorithm);