diff --git a/spec/unit/formatting.spec.js b/spec/unit/formatting.spec.js
index a2e5a923d..27ea52491 100644
--- a/spec/unit/formatting.spec.js
+++ b/spec/unit/formatting.spec.js
@@ -60,6 +60,11 @@ describe("Formatting", function() {
                 formatting.ircToHtml("The quick brown \u0002fox\u000f jumps over the lazy \u0002dog\u000f.")
             ).toBe("The quick brown <b>fox</b> jumps over the lazy <b>dog</b>.");
         });
+        it("should <del> for strikethrough inputs", function() {
+            expect(
+                formatting.ircToHtml("The quick brown \u001efox\u000f jumps over the lazy \u001edog\u000f.")
+            ).toBe("The quick brown <del>fox</del> jumps over the lazy <del>dog</del>.");
+        });
         it("should <code> for monospace inputs", function() {
             expect(
                 formatting.ircToHtml("The quick brown \u0011fox\u000f jumps over the lazy \u0011dog\u000f.")
diff --git a/src/irc/formatting.ts b/src/irc/formatting.ts
index 136b7f18c..1456289c2 100644
--- a/src/irc/formatting.ts
+++ b/src/irc/formatting.ts
@@ -167,7 +167,7 @@ export function htmlToIrc(html?: string): string|null {
     // things like case-sensitivity and spacing). Use he to decode any html entities
     // because we don't want those.
     let cleanHtml = he.decode(sanitizeHtml(html, {
-        allowedTags: ["b", "code", "i", "u", "strong", "font", "em"],
+        allowedTags: ["b", "code", "del", "i", "u", "strong", "font", "em"],
         allowedAttributes: {
             font: ["color"]
         }
@@ -262,13 +262,13 @@ export function ircToHtml(text: string): string {
     // Replace all mIRC formatting characters.
     // The color character can have arguments.
     // The regex matches:
-    // - Any single 'simple' formatting character: \x02, \x11, \x1d, \x1f, \x0f and
-    //   \x16 for bold, italics, underline, reset and reverse respectively.
+    // - Any single 'simple' formatting character: \x02, \x11, \x1d, \x1e, \x1f, \x0f and
+    //   \x16 for bold, italics, underline, strikethrough, reset and reverse respectively.
     // - The colour formatting character (\x03) followed by 0 to 2 digits for
     //   the foreground colour and (optionally) a comma and 1-2 digits for the
     //   background colour.
     // eslint-disable-next-line no-control-regex
-    const colorRegex = /[\x02\x11\x1d\x1f\x0f\x16]|\x03(\d{0,2})(?:,(\d{1,2}))?/g;
+    const colorRegex = /[\x02\x11\x1d\x1e\x1f\x0f\x16]|\x03(\d{0,2})(?:,(\d{1,2}))?/g;
 
     // Maintain a small state machine of which tags are open so we can close the right
     // ones on RESET codes and toggle appropriately if they do the same code again.