diff --git a/app/Repositories/ConfigurationJsonRepository.php b/app/Repositories/ConfigurationJsonRepository.php
index c9924286..43359a56 100644
--- a/app/Repositories/ConfigurationJsonRepository.php
+++ b/app/Repositories/ConfigurationJsonRepository.php
@@ -83,6 +83,10 @@ protected function get()
                 $baseConfig = $this->resolveExtend($baseConfig);
             }
 
+            if (isset($baseConfig['rules'])) {
+                $baseConfig['rules'] = $this->normalizeRuleValues($baseConfig['rules']);
+            }
+
             return tap($baseConfig, function ($configuration) {
                 if (! is_array($configuration)) {
                     abort(1, sprintf('The configuration file [%s] is not valid JSON.', $this->path));
@@ -93,6 +97,25 @@ protected function get()
         return [];
     }
 
+    /**
+     * Normalize shorthand rule values into explicit configuration arrays as expected by PHP-CS-Fixer.
+     *
+     * @param  array<string, mixed>  $rules
+     * @return array<string, mixed>
+     */
+    protected function normalizeRuleValues(array $rules): array
+    {
+        if (array_key_exists('cast_spaces', $rules)) {
+            $rules['cast_spaces'] = match ($rules['cast_spaces']) {
+                false => ['space' => 'none'],
+                true => ['space' => 'single'],
+                default => $rules['cast_spaces'],
+            };
+        }
+
+        return $rules;
+    }
+
     /**
      * Determine if a local or remote file exists.
      *
diff --git a/tests/Fixtures/rules/pint_cast_spaces_array.json b/tests/Fixtures/rules/pint_cast_spaces_array.json
new file mode 100644
index 00000000..4da2e502
--- /dev/null
+++ b/tests/Fixtures/rules/pint_cast_spaces_array.json
@@ -0,0 +1,7 @@
+{
+    "rules": {
+        "cast_spaces": {
+            "space": "single"
+        }
+    }
+}
diff --git a/tests/Fixtures/rules/pint_cast_spaces_false.json b/tests/Fixtures/rules/pint_cast_spaces_false.json
new file mode 100644
index 00000000..0347f819
--- /dev/null
+++ b/tests/Fixtures/rules/pint_cast_spaces_false.json
@@ -0,0 +1,5 @@
+{
+    "rules": {
+        "cast_spaces": false
+    }
+}
diff --git a/tests/Fixtures/rules/pint_cast_spaces_true.json b/tests/Fixtures/rules/pint_cast_spaces_true.json
new file mode 100644
index 00000000..1b412f4e
--- /dev/null
+++ b/tests/Fixtures/rules/pint_cast_spaces_true.json
@@ -0,0 +1,5 @@
+{
+    "rules": {
+        "cast_spaces": true
+    }
+}
diff --git a/tests/Unit/Repositories/ConfigurationJsonRepositoryTest.php b/tests/Unit/Repositories/ConfigurationJsonRepositoryTest.php
index b6d6bae0..d2df5c5e 100644
--- a/tests/Unit/Repositories/ConfigurationJsonRepositoryTest.php
+++ b/tests/Unit/Repositories/ConfigurationJsonRepositoryTest.php
@@ -75,3 +75,27 @@
 
     $repository->finder();
 })->throws(LogicException::class);
+
+it('normalizes cast_spaces false to none', function () {
+    $repository = new ConfigurationJsonRepository(dirname(__DIR__, 2).'/Fixtures/rules/pint_cast_spaces_false.json', null);
+
+    expect($repository->rules())->toBe([
+        'cast_spaces' => ['space' => 'none'],
+    ]);
+});
+
+it('normalizes cast_spaces true to single', function () {
+    $repository = new ConfigurationJsonRepository(dirname(__DIR__, 2).'/Fixtures/rules/pint_cast_spaces_true.json', null);
+
+    expect($repository->rules())->toBe([
+        'cast_spaces' => ['space' => 'single'],
+    ]);
+});
+
+it('preserves explicit cast_spaces array', function () {
+    $repository = new ConfigurationJsonRepository(dirname(__DIR__, 2).'/Fixtures/rules/pint_cast_spaces_array.json', null);
+
+    expect($repository->rules())->toBe([
+        'cast_spaces' => ['space' => 'single'],
+    ]);
+});