diff --git a/lib/shared/reaction-utils.js b/lib/shared/reaction-utils.js
--- a/lib/shared/reaction-utils.js
+++ b/lib/shared/reaction-utils.js
@@ -15,7 +15,12 @@
 
     reactionText.push(reaction);
     if (reactionInfo.users.size > 1) {
-      reactionText.push(reactionInfo.users.size);
+      let numOfReacts = reactionInfo.users.size;
+      if (numOfReacts > 9) {
+        numOfReacts = '9+';
+      }
+
+      reactionText.push(numOfReacts);
     }
   }
 
diff --git a/lib/shared/reaction-utils.test.js b/lib/shared/reaction-utils.test.js
--- a/lib/shared/reaction-utils.test.js
+++ b/lib/shared/reaction-utils.test.js
@@ -110,5 +110,36 @@
         expect(stringForReactionList(reactionsMap)).toBe('👍 😆 3');
       },
     );
+
+    it(
+      'should return (👍 9+) for a message with 12 user likes' +
+        ' not including the viewer',
+      () => {
+        const messageLikesUsers = [
+          '86622',
+          '12345',
+          '67890',
+          '83889',
+          '49203',
+          '12932',
+          '83029',
+          '72902',
+          '49022',
+          '48902',
+          '80922',
+          '12890',
+        ];
+        const messageLikesUsersSet = new Set(messageLikesUsers);
+        const messageLikesInfo = {
+          users: messageLikesUsersSet,
+          viewerReacted: false,
+        };
+
+        const reactionsMap = new Map<string, MessageReactionInfo>();
+        reactionsMap.set('👍', messageLikesInfo);
+
+        expect(stringForReactionList(reactionsMap)).toBe('👍 9+');
+      },
+    );
   },
 );