diff --git a/WikiClientLibrary/Infrastructures/MediaWikiHelper.cs b/WikiClientLibrary/Infrastructures/MediaWikiHelper.cs
index 4fdb67160..57d95008c 100644
--- a/WikiClientLibrary/Infrastructures/MediaWikiHelper.cs
+++ b/WikiClientLibrary/Infrastructures/MediaWikiHelper.cs
@@ -35,8 +35,8 @@ public static JsonSerializer CreateWikiJsonSerializer()
         /// Converts the specified relative protocol URL (starting with <c>//</c>) to absolute protocol URL.
         /// </summary>
         /// <param name="relativeProtocolUrl">The URL to be converted.</param>
-        /// <param name="defaultProtocol">For protocol-relative URL, (e.g. <c>//en.wikipedia.org/</c>)
-        /// specifies the default protocol to use. (e.g. <c>https:</c>)</param>
+        /// <param name="defaultProtocol">For protocol-relative URL,(e.g. <c>//en.wikipedia.org/</c>),
+        /// specifies the default protocol to use. (e.g. <c>https</c>)</param>
         /// <exception cref="ArgumentNullException">Either <paramref name="relativeProtocolUrl"/> or <paramref name="defaultProtocol"/> is <c>null</c>.</exception>
         /// <returns>The URL with absolute protocol. If the specified URL is not a relative protocol URL,
         /// it will be returned directly.</returns>
@@ -45,12 +45,12 @@ public static string MakeAbsoluteProtocol(string relativeProtocolUrl, string def
             if (relativeProtocolUrl == null) throw new ArgumentNullException(nameof(relativeProtocolUrl));
             if (defaultProtocol == null) throw new ArgumentNullException(nameof(defaultProtocol));
             var url = relativeProtocolUrl;
-            if (url.StartsWith("//")) url = defaultProtocol + url;
+            if (url.StartsWith("//")) url = defaultProtocol + ":" + url;
             return url;
         }
 
         /// <summary>
-        /// Combines a base URL and a relative URL, using <c>https:</c> for relative protocol URL.
+        /// Combines a base URL and a relative URL, using <c>https</c> for relative protocol URL.
         /// </summary>
         /// <param name="baseUrl">The base absolute URL. Can be relative protocol URL.</param>
         /// <param name="relativeUrl">The relative URL.</param>
@@ -58,7 +58,7 @@ public static string MakeAbsoluteProtocol(string relativeProtocolUrl, string def
         /// <returns>The combined URL with absolute protocol.</returns>
         public static string MakeAbsoluteUrl(string baseUrl, string relativeUrl)
         {
-            return MakeAbsoluteUrl(baseUrl, relativeUrl, "https:");
+            return MakeAbsoluteUrl(baseUrl, relativeUrl, "https");
         }
 
         /// <summary>
diff --git a/WikiClientLibrary/Sites/SiteInfo.cs b/WikiClientLibrary/Sites/SiteInfo.cs
index 5f3b43b52..3e82c7e17 100644
--- a/WikiClientLibrary/Sites/SiteInfo.cs
+++ b/WikiClientLibrary/Sites/SiteInfo.cs
@@ -85,8 +85,8 @@ public string MakeArticleUrl(string title)
         /// Makes the full URL to the page of specified title.
         /// </summary>
         /// <param name="title">The title of the article.</param>
-        /// <param name="defaultProtocol">For protocol-relative URL, (e.g. <c>//en.wikipedia.org/</c>)
-        /// specifies the default protocol to use. (e.g. <c>https:</c>)</param>
+        /// <param name="defaultProtocol">For protocol-relative URL (e.g. <c>//en.wikipedia.org/</c>),
+        /// specifies the default protocol to use. (e.g. <c>https</c>)</param>
         /// <exception cref="ArgumentNullException">Either <paramref name="title"/> or <paramref name="defaultProtocol"/> is <c>null</c>.</exception>
         /// <returns>The full URL of the article.</returns>
         public string MakeArticleUrl(string title, string defaultProtocol)