diff --git a/homeassistant/components/mqtt/strings.json b/homeassistant/components/mqtt/strings.json
index 30cb57bb85a..0ef5ea29068 100644
--- a/homeassistant/components/mqtt/strings.json
+++ b/homeassistant/components/mqtt/strings.json
@@ -52,7 +52,7 @@
       "bad_certificate": "The CA certificate is invalid",
       "bad_client_cert": "Invalid client certificate, ensure a PEM coded file is supplied",
       "bad_client_key": "Invalid private key, ensure a PEM coded file is supplied without password",
-      "bad_client_cert_key": "Client certificate and private are no valid pair",
+      "bad_client_cert_key": "Client certificate and private key are not a valid pair",
       "bad_ws_headers": "Supply valid HTTP headers as a JSON object",
       "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]",
       "invalid_inclusion": "The client certificate and private key must be configurered together"
diff --git a/homeassistant/components/mqtt/translations/en.json b/homeassistant/components/mqtt/translations/en.json
index 78f91c27f30..dd3b69ec2f4 100644
--- a/homeassistant/components/mqtt/translations/en.json
+++ b/homeassistant/components/mqtt/translations/en.json
@@ -8,7 +8,7 @@
             "bad_birth": "Invalid birth topic",
             "bad_certificate": "The CA certificate is invalid",
             "bad_client_cert": "Invalid client certificate, ensure a PEM coded file is supplied",
-            "bad_client_cert_key": "Client certificate and private are no valid pair",
+            "bad_client_cert_key": "Client certificate and private key are not a valid pair",
             "bad_client_key": "Invalid private key, ensure a PEM coded file is supplied without password",
             "bad_discovery_prefix": "Invalid discovery prefix",
             "bad_will": "Invalid will topic",