diff --git a/src/Type/PHPUnit/Assert/AssertTypeSpecifyingExtensionHelper.php b/src/Type/PHPUnit/Assert/AssertTypeSpecifyingExtensionHelper.php
index 2e8e828..a7edf21 100644
--- a/src/Type/PHPUnit/Assert/AssertTypeSpecifyingExtensionHelper.php
+++ b/src/Type/PHPUnit/Assert/AssertTypeSpecifyingExtensionHelper.php
@@ -262,8 +262,14 @@ private static function getExpressionResolvers(): array
 						]
 					);
 				},
-				'ArrayHasKey' => static function (Scope $scope, Arg $key, Arg $array): FuncCall {
-					return new FuncCall(new Name('array_key_exists'), [$key, $array]);
+				'ArrayHasKey' => static function (Scope $scope, Arg $key, Arg $array): Expr {
+					return new Expr\BinaryOp\BooleanOr(
+						new Expr\BinaryOp\BooleanAnd(
+							new Expr\Instanceof_($array->value, new Name('ArrayAccess')),
+							new Expr\MethodCall($array->value, 'offsetExists', [$key])
+						),
+						new FuncCall(new Name('array_key_exists'), [$key, $array])
+					);
 				},
 				'ObjectHasAttribute' => static function (Scope $scope, Arg $property, Arg $object): FuncCall {
 					return new FuncCall(new Name('property_exists'), [$object, $property]);
diff --git a/tests/Type/PHPUnit/data/assert-function.php b/tests/Type/PHPUnit/data/assert-function.php
index f3222f3..9af1d26 100644
--- a/tests/Type/PHPUnit/data/assert-function.php
+++ b/tests/Type/PHPUnit/data/assert-function.php
@@ -31,15 +31,21 @@ public function assertInstanceOfWorksWithTemplate($o, $class): void
 		assertType(\DateTimeInterface::class, $o);
 	}
 
-	public function arrayHasNumericKey(array $a): void {
+	public function arrayHasNumericKey(array $a, \ArrayAccess $b): void {
 		assertArrayHasKey(0, $a);
 		assertType('array&hasOffset(0)', $a);
+
+		assertArrayHasKey(0, $b);
+		assertType('ArrayAccess', $b);
 	}
 
-	public function arrayHasStringKey(array $a): void
+	public function arrayHasStringKey(array $a, \ArrayAccess $b): void
 	{
 		assertArrayHasKey('key', $a);
 		assertType("array&hasOffset('key')", $a);
+
+		assertArrayHasKey('key', $b);
+		assertType("ArrayAccess", $b);
 	}
 
 	public function objectHasAttribute(object $a): void