diff --git a/src/Formatter.php b/src/Formatter.php
index 8dfb231..174070a 100644
--- a/src/Formatter.php
+++ b/src/Formatter.php
@@ -106,11 +106,11 @@ private function predicateToArray(Predicate $predicate, bool $withAdditionalFiel
             case Predicate::OPERATOR_OR:
             case Predicate::OPERATOR_NOT:
                 $value = [];
-                foreach ($predicate->getConfig() as $predicateOperator => $predicateConfig) {
+                foreach ($predicate->getConfig() as $predicateConfig) {
                     if ($predicateConfig instanceof Predicate) {
-                        $value = array_merge($value, $this->predicateToArray($predicateConfig, false));
+                        $value[] = $this->predicateToArray($predicateConfig, false);
                     } else {
-                        $value[$predicateOperator] = $predicateConfig;
+                        $value[] = $predicateConfig;
                     }
                 }
                 break;
diff --git a/src/Predicate.php b/src/Predicate.php
index e9e497b..3e3030a 100644
--- a/src/Predicate.php
+++ b/src/Predicate.php
@@ -30,7 +30,7 @@ class Predicate
     private string $operator;
 
     /**
-     * @var array<string, mixed>
+     * @var array<string|int, mixed>
      */
     private array $config = [];
 
@@ -102,7 +102,7 @@ public function setOperator(string $operator): self
     }
 
     /**
-     * @return array<string, mixed>
+     * @return array<string|int, mixed>
      */
     public function getConfig(): array
     {
@@ -110,7 +110,7 @@ public function getConfig(): array
     }
 
     /**
-     * @param array<string, mixed> $config
+     * @param array<string|int, mixed> $config
      */
     public function setConfig(array $config): self
     {
diff --git a/tests/Unit/FormatterTest.php b/tests/Unit/FormatterTest.php
index 5d1535d..53e41ba 100644
--- a/tests/Unit/FormatterTest.php
+++ b/tests/Unit/FormatterTest.php
@@ -157,10 +157,14 @@ public function testPredicateWithPredicates(): void
         $predicate2 = new Predicate(Predicate::OPERATOR_START_WITH);
         $predicate2->setConfig(['path' => '/test2']);
 
+        $predicate3 = new Predicate(Predicate::OPERATOR_START_WITH);
+        $predicate3->setConfig(['path' => '/test3']);
+
         $predicate = new Predicate(Predicate::OPERATOR_AND);
         $predicate->setConfig([
-            $predicate1->getOperator() => $predicate1,
-            $predicate2->getOperator() => $predicate2,
+            $predicate1,
+            $predicate2,
+            $predicate3,
         ]);
 
         $stub = new Stub();
@@ -177,11 +181,20 @@ public function testPredicateWithPredicates(): void
         $this->assertSame([
             [
                 'and' => [
-                    'equals' => [
-                        'path' => '/test1',
+                    [
+                        'equals' => [
+                            'path' => '/test1',
+                        ],
+                    ],
+                    [
+                        'startsWith' => [
+                            'path' => '/test2',
+                        ],
                     ],
-                    'startsWith' => [
-                        'path' => '/test2',
+                    [
+                        'startsWith' => [
+                            'path' => '/test3',
+                        ],
                     ],
                 ],
                 'caseSensitive' => false,
@@ -194,8 +207,9 @@ public function testPredicateWithPredicatesAsArray(): void
     {
         $predicate = new Predicate(Predicate::OPERATOR_AND);
         $predicate->setConfig([
-            Predicate::OPERATOR_EQUALS => ['path' => '/test1'],
-            Predicate::OPERATOR_START_WITH => ['path' => '/test2'],
+            [Predicate::OPERATOR_EQUALS => ['path' => '/test1']],
+            [Predicate::OPERATOR_START_WITH => ['path' => '/test2']],
+            [Predicate::OPERATOR_START_WITH => ['path' => '/test3']],
         ]);
 
         $stub = new Stub();
@@ -212,11 +226,20 @@ public function testPredicateWithPredicatesAsArray(): void
         $this->assertSame([
             [
                 'and' => [
-                    'equals' => [
-                        'path' => '/test1',
+                    [
+                        'equals' => [
+                            'path' => '/test1',
+                        ],
+                    ],
+                    [
+                        'startsWith' => [
+                            'path' => '/test2',
+                        ],
                     ],
-                    'startsWith' => [
-                        'path' => '/test2',
+                    [
+                        'startsWith' => [
+                            'path' => '/test3',
+                        ],
                     ],
                 ],
                 'caseSensitive' => false,