diff --git a/addons/mail/static/src/models/user_setting.js b/addons/mail/static/src/models/user_setting.js
index 00cde9c6e57..0761c825c72 100644
--- a/addons/mail/static/src/models/user_setting.js
+++ b/addons/mail/static/src/models/user_setting.js
@@ -74,7 +74,7 @@ Model({
         pushToTalkKeyToString() {
             const { shiftKey, ctrlKey, altKey, key } = this.pushToTalkKeyFormat();
             const f = (k, name) => (k ? name : "");
-            return `${f(ctrlKey, "Ctrl + ")}${f(altKey, "Alt + ")}${f(shiftKey, "Shift + ")}${key}`;
+            return `${f(ctrlKey, "Ctrl + ")}${f(altKey, "Alt + ")}${f(shiftKey, "Shift + ")}${key === " " ? "Space" : key}`;
         },
         /**
          * @param {String} audioInputDeviceId