diff --git a/ts/util/emoji.ts b/ts/util/emoji.ts
index 1242e44f2..3d9377b7f 100644
--- a/ts/util/emoji.ts
+++ b/ts/util/emoji.ts
@@ -26,7 +26,7 @@ export function findImage(value: string, variation?: string) {
 
 export function replaceColons(str: string) {
   return str.replace(instance.rx_colons, m => {
-    const name = m.substr(1, m.length - 2);
+    const name = m.substr(1, m.length - 2).toLowerCase();
     const code = instance.map.colons[name];
     if (code) {
       return instance.data[code][0][0];