diff --git a/web-client/iron-remote-desktop/src/services/remote-desktop.service.ts b/web-client/iron-remote-desktop/src/services/remote-desktop.service.ts
index 4921696a..aa0cbb65 100644
--- a/web-client/iron-remote-desktop/src/services/remote-desktop.service.ts
+++ b/web-client/iron-remote-desktop/src/services/remote-desktop.service.ts
@@ -343,7 +343,7 @@ export class RemoteDesktopService {
                 }
 
                 const keyCode = scanCode(evt.key);
-                const isUnicodeCharacter = Number.isNaN(keyCode) && evt.key.length === 1;
+                const isUnicodeCharacter = Number.isNaN(keyCode) && evt.key.length === 1 && !isModifierKey;
 
                 if (isUnicodeCharacter && sendAsUnicode) {
                     this.doTransactionFromDeviceEvents([unicodeEvent(evt.key)]);