diff --git a/chat-formatter.js b/chat-formatter.js
index a91f6e0f98..0344f59e5f 100644
--- a/chat-formatter.js
+++ b/chat-formatter.js
@@ -277,11 +277,12 @@ class TextFormatter {
 					term += `<small> &lt;${shortUri}&gt;</small>`;
 				}
 				if (colonPos > 0) {
-					switch (this.slice(start + 2, colonPos)) {
+					const key = this.slice(start + 2, colonPos);
+					switch (key) {
 					case 'w':
 					case 'wiki':
-						term = term.slice(term.charAt(5) === ' ' ? 6 : 5);
-						uri = `http://en.wikipedia.org/w/index.php?title=Special:Search&search=${this.toUriComponent(term)}`;
+						term = term.slice(term.charAt(key.length + 1) === ' ' ? key.length + 2 : key.length + 1);
+						uri = `//en.wikipedia.org/w/index.php?title=Special:Search&search=${this.toUriComponent(term)}`;
 						term = `wiki: ${term}`;
 						break;
 					}
diff --git a/test/application/chat.js b/test/application/chat.js
index 3e98eaf7eb..df2b080660 100644
--- a/test/application/chat.js
+++ b/test/application/chat.js
@@ -62,7 +62,7 @@ describe('Chat', function () {
 		);
 		assert.strictEqual(
 			Chat.formatText(`[[wiki: Pokemon]]`, true),
-			`<a href="http://en.wikipedia.org/w/index.php?title=Special:Search&search=%20Pokemon" target="_blank" rel="noopener">wiki: Pokemon</a>`
+			`<a href="//en.wikipedia.org/w/index.php?title=Special:Search&search=Pokemon" target="_blank" rel="noopener">wiki: Pokemon</a>`
 		);
 		assert.strictEqual(
 			Chat.formatText(`:)`, true),