diff --git a/resources/assets/js/views/settings/currencies.js b/resources/assets/js/views/settings/currencies.js
index a12b99393..52e2633ee 100644
--- a/resources/assets/js/views/settings/currencies.js
+++ b/resources/assets/js/views/settings/currencies.js
@@ -54,5 +54,13 @@ const app = new Vue({
             .catch(error => {
             });
         }
+    },
+
+    watch: {
+        'form.default_currency': function (newVal, oldVal) {
+            if (newVal == 1) {
+                this.form.rate = 1;
+            }
+        },
     }
 });
diff --git a/resources/views/settings/currencies/create.blade.php b/resources/views/settings/currencies/create.blade.php
index 2381c8389..e5563e765 100644
--- a/resources/views/settings/currencies/create.blade.php
+++ b/resources/views/settings/currencies/create.blade.php
@@ -22,7 +22,7 @@
 
                         <x-form.group.select name="code" label="{{ trans('currencies.code') }}" :options="$codes" searchable change="onChangeCode" />
 
-                        <x-form.group.text name="rate" label="{{ trans('currencies.rate') }}" @input="onChangeRate" />
+                        <x-form.group.text name="rate" label="{{ trans('currencies.rate') }}" @input="onChangeRate" ::disabled="form.default_currency == 1" />
 
                         <x-form.group.select name="precision" label="{{ trans('currencies.precision') }}" :options="$precisions" model="form.precision" />
 
diff --git a/resources/views/settings/currencies/edit.blade.php b/resources/views/settings/currencies/edit.blade.php
index 7a10ce6a7..f0c6a861a 100644
--- a/resources/views/settings/currencies/edit.blade.php
+++ b/resources/views/settings/currencies/edit.blade.php
@@ -16,7 +16,7 @@
 
                         <x-form.group.select name="code" label="{{ trans('currencies.code') }}" :options="$codes" searchable change="onChangeCode" />
 
-                        <x-form.group.text name="rate" label="{{ trans('currencies.rate') }}" @input="onChangeRate" />
+                        <x-form.group.text name="rate" label="{{ trans('currencies.rate') }}" @input="onChangeRate" ::disabled="form.default_currency == 1" />
 
                         <x-form.group.select name="precision" label="{{ trans('currencies.precision') }}" :options="$precisions" model="form.precision" />