diff --git a/application/Espo/Core/Formula/Functions/ArrayGroup/IndexType.php b/application/Espo/Core/Formula/Functions/ArrayGroup/IndexOfType.php
similarity index 98%
rename from application/Espo/Core/Formula/Functions/ArrayGroup/IndexType.php
rename to application/Espo/Core/Formula/Functions/ArrayGroup/IndexOfType.php
index 641842d1a3..e4cbaf2f34 100644
--- a/application/Espo/Core/Formula/Functions/ArrayGroup/IndexType.php
+++ b/application/Espo/Core/Formula/Functions/ArrayGroup/IndexOfType.php
@@ -34,7 +34,7 @@ use Espo\Core\Formula\{
     ArgumentList,
 };
 
-class IndexType extends BaseFunction
+class IndexOfType extends BaseFunction
 {
     public function process(ArgumentList $args)
     {
diff --git a/application/Espo/Resources/metadata/app/formula.json b/application/Espo/Resources/metadata/app/formula.json
index d7cc3cbb64..1b50f0c608 100644
--- a/application/Espo/Resources/metadata/app/formula.json
+++ b/application/Espo/Resources/metadata/app/formula.json
@@ -404,8 +404,8 @@
             "returnType": "string"
         },
         {
-            "name": "array\\index",
-            "insertText": "array\\index(LIST, ELEMENT)",
+            "name": "array\\indexOf",
+            "insertText": "array\\indexOf(LIST, ELEMENT)",
             "returnType": "?int"
         },
         {
diff --git a/tests/unit/Espo/Core/Formula/EvaluatorTest.php b/tests/unit/Espo/Core/Formula/EvaluatorTest.php
index d44039be63..bc28a109d8 100644
--- a/tests/unit/Espo/Core/Formula/EvaluatorTest.php
+++ b/tests/unit/Espo/Core/Formula/EvaluatorTest.php
@@ -235,45 +235,45 @@ class EvaluatorTest extends \PHPUnit\Framework\TestCase
         $this->assertFalse($actual);
     }
 
-    public function testArrayIndex1(): void
+    public function testArrayIndexOf1(): void
     {
-        $expression = "array\\index(list(0, 1, 2), 1)";
+        $expression = "array\\indexOf(list(0, 1, 2), 1)";
 
         $actual = $this->evaluator->process($expression);
 
         $this->assertEquals(1, $actual);
     }
 
-    public function testArrayIndex2(): void
+    public function testArrayIndexOf2(): void
     {
-        $expression = "array\\index(list('0', '1', '2'), '0')";
+        $expression = "array\\indexOf(list('0', '1', '2'), '0')";
 
         $actual = $this->evaluator->process($expression);
 
         $this->assertEquals(0, $actual);
     }
 
-    public function testArrayIndex3(): void
+    public function testArrayIndexOf3(): void
     {
-        $expression = "array\\index(list('0', '1', '2'), 1)";
+        $expression = "array\\indexOf(list('0', '1', '2'), 1)";
 
         $actual = $this->evaluator->process($expression);
 
         $this->assertEquals(null, $actual);
     }
 
-    public function testArrayIndex4(): void
+    public function testArrayIndexOf4(): void
     {
-        $expression = "array\\index(list(), 1)";
+        $expression = "array\\indexOf(list(), 1)";
 
         $actual = $this->evaluator->process($expression);
 
         $this->assertEquals(null, $actual);
     }
 
-    public function testArrayIndex5(): void
+    public function testArrayIndexOf5(): void
     {
-        $expression = "array\\index(null, 1)";
+        $expression = "array\\indexOf(null, 1)";
 
         $actual = $this->evaluator->process($expression);