diff --git a/web/source/osk/banner.ts b/web/source/osk/banner.ts
index 8bd2b83356..e71a2e8f32 100644
--- a/web/source/osk/banner.ts
+++ b/web/source/osk/banner.ts
@@ -399,7 +399,7 @@ namespace com.keyman.osk {
      * @param    outputTarget
      * @returns  true
      */
-    suggestionApplied(outputTarget: text.OutputTarget): boolean {
+    suggestionApplied: (outputTarget: text.OutputTarget) => boolean = function(this: SuggestionBanner, outputTarget: text.OutputTarget) {
       const keyman = com.keyman.singleton;
       // Tell the keyboard that the current layer has not changed
       keyman.core.keyboardProcessor.newLayerStore.set('');
@@ -411,7 +411,7 @@ namespace com.keyman.osk {
         ?.finalize(keyman.core.keyboardProcessor, outputTarget, true);
 
       return true;
-    };
+    }.bind(this);
 
     postConfigure() {
       let keyman = com.keyman.singleton;
@@ -427,6 +427,7 @@ namespace com.keyman.osk {
       keyman.core.languageProcessor.removeListener('suggestionsready', manager.updateSuggestions);
       keyman.core.languageProcessor.removeListener('tryaccept', manager.tryAccept);
       keyman.core.languageProcessor.removeListener('tryrevert', manager.tryRevert);
+      keyman.core.languageProcessor.removeListener('suggestionapplied', this.suggestionApplied);
     }
   }