diff --git a/dictionaries/CallMap.php b/dictionaries/CallMap.php
index 5ce9b20762c..cfbce40dcc7 100644
--- a/dictionaries/CallMap.php
+++ b/dictionaries/CallMap.php
@@ -418,9 +418,7 @@
 'array_uintersect_assoc\'1' => ['array', 'array'=>'array', 'rest'=>'array', 'arr3'=>'array', 'arg4'=>'array|callable', '...rest='=>'array|callable(mixed,mixed):int'],
 'array_uintersect_uassoc' => ['array', 'array'=>'array', 'rest'=>'array', 'data_compare_func'=>'callable(mixed,mixed):int', 'key_compare_func'=>'callable(mixed,mixed):int'],
 'array_uintersect_uassoc\'1' => ['array', 'array'=>'array', 'rest'=>'array', 'arr3'=>'array', 'arg4'=>'array|callable(mixed,mixed):int', 'arg5'=>'array|callable(mixed,mixed):int', '...rest='=>'array|callable(mixed,mixed):int'],
-'array_unique' => ['array', 'array'=>'array', 'flags='=>'0'],
-'array_unique\'1' => ['array<int|float|string|null>', 'array'=>'array<int|float|string|null>', 'flags='=>'1'],
-'array_unique\'2' => ['array<int|float|string|bool|\Stringable|null>', 'array'=>'array<int|float|string|bool|\Stringable|null>', 'flags='=>'2|5'],
+'array_unique' => ['array', 'array'=>'array', 'flags='=>'int'],
 'array_unshift' => ['int', '&rw_array'=>'array', '...values='=>'mixed'],
 'array_values' => ['list<mixed>', 'array'=>'array'],
 'array_walk' => ['bool', '&rw_array'=>'array', 'callback'=>'callable', 'arg='=>'mixed'],
diff --git a/dictionaries/CallMap_historical.php b/dictionaries/CallMap_historical.php
index 075c0a161bd..b1c8b9488ff 100644
--- a/dictionaries/CallMap_historical.php
+++ b/dictionaries/CallMap_historical.php
@@ -9381,9 +9381,7 @@
     'array_uintersect_assoc\'1' => ['array', 'array'=>'array', 'rest'=>'array', 'arr3'=>'array', 'arg4'=>'array|callable', '...rest='=>'array|callable(mixed,mixed):int'],
     'array_uintersect_uassoc' => ['array', 'array'=>'array', 'rest'=>'array', 'data_compare_func'=>'callable(mixed,mixed):int', 'key_compare_func'=>'callable(mixed,mixed):int'],
     'array_uintersect_uassoc\'1' => ['array', 'array'=>'array', 'rest'=>'array', 'arr3'=>'array', 'arg4'=>'array|callable(mixed,mixed):int', 'arg5'=>'array|callable(mixed,mixed):int', '...rest='=>'array|callable(mixed,mixed):int'],
-    'array_unique' => ['array', 'array'=>'array', 'flags='=>'0'],
-    'array_unique\'1' => ['array<int|float|string|null>', 'array'=>'array<int|float|string|null>', 'flags='=>'1'],
-    'array_unique\'2' => ['array<int|float|string|bool|\Stringable|null>', 'array'=>'array<int|float|string|bool|\Stringable|null>', 'flags='=>'2|5'],
+    'array_unique' => ['array', 'array'=>'array', 'flags='=>'int'],
     'array_unshift' => ['int', '&rw_array'=>'array', '...values'=>'mixed'],
     'array_values' => ['list<mixed>', 'array'=>'array'],
     'array_walk' => ['bool', '&rw_array'=>'array', 'callback'=>'callable', 'arg='=>'mixed'],
diff --git a/src/Psalm/Internal/Provider/FunctionReturnTypeProvider.php b/src/Psalm/Internal/Provider/FunctionReturnTypeProvider.php
index bdd59a0abc4..0d2552d8e48 100644
--- a/src/Psalm/Internal/Provider/FunctionReturnTypeProvider.php
+++ b/src/Psalm/Internal/Provider/FunctionReturnTypeProvider.php
@@ -22,7 +22,6 @@
 use Psalm\Internal\Provider\ReturnTypeProvider\ArrayReverseReturnTypeProvider;
 use Psalm\Internal\Provider\ReturnTypeProvider\ArraySliceReturnTypeProvider;
 use Psalm\Internal\Provider\ReturnTypeProvider\ArraySpliceReturnTypeProvider;
-use Psalm\Internal\Provider\ReturnTypeProvider\ArrayUniqueReturnTypeProvider;
 use Psalm\Internal\Provider\ReturnTypeProvider\BasenameReturnTypeProvider;
 use Psalm\Internal\Provider\ReturnTypeProvider\DirnameReturnTypeProvider;
 use Psalm\Internal\Provider\ReturnTypeProvider\FilterVarReturnTypeProvider;
@@ -81,7 +80,6 @@ public function __construct()
         $this->registerClass(ArraySliceReturnTypeProvider::class);
         $this->registerClass(ArraySpliceReturnTypeProvider::class);
         $this->registerClass(ArrayReverseReturnTypeProvider::class);
-        $this->registerClass(ArrayUniqueReturnTypeProvider::class);
         $this->registerClass(ArrayFillReturnTypeProvider::class);
         $this->registerClass(ArrayFillKeysReturnTypeProvider::class);
         $this->registerClass(FilterVarReturnTypeProvider::class);
diff --git a/src/Psalm/Internal/Provider/ReturnTypeProvider/ArrayUniqueReturnTypeProvider.php b/src/Psalm/Internal/Provider/ReturnTypeProvider/ArrayUniqueReturnTypeProvider.php
deleted file mode 100644
index 1b46a3fb901..00000000000
--- a/src/Psalm/Internal/Provider/ReturnTypeProvider/ArrayUniqueReturnTypeProvider.php
+++ /dev/null
@@ -1,60 +0,0 @@
-<?php
-
-namespace Psalm\Internal\Provider\ReturnTypeProvider;
-
-use Psalm\Internal\Analyzer\StatementsAnalyzer;
-use Psalm\Plugin\EventHandler\Event\FunctionReturnTypeProviderEvent;
-use Psalm\Plugin\EventHandler\FunctionReturnTypeProviderInterface;
-use Psalm\Type;
-use Psalm\Type\Atomic\TArray;
-use Psalm\Type\Atomic\TKeyedArray;
-use Psalm\Type\Atomic\TNonEmptyArray;
-use Psalm\Type\Union;
-
-/**
- * @internal
- */
-class ArrayUniqueReturnTypeProvider implements FunctionReturnTypeProviderInterface
-{
-    /**
-     * @return array<lowercase-string>
-     */
-    public static function getFunctionIds(): array
-    {
-        return ['array_unique'];
-    }
-
-    public static function getFunctionReturnType(FunctionReturnTypeProviderEvent $event): Union
-    {
-        $statements_source = $event->getStatementsSource();
-        $call_args = $event->getCallArgs();
-        if (!$statements_source instanceof StatementsAnalyzer) {
-            return Type::getMixed();
-        }
-
-        $first_arg = $call_args[0]->value ?? null;
-
-        $first_arg_array = $first_arg
-            && ($first_arg_type = $statements_source->node_data->getType($first_arg))
-            && $first_arg_type->hasType('array')
-            && ($array_atomic_type = $first_arg_type->getArray())
-            && ($array_atomic_type instanceof TArray
-                || $array_atomic_type instanceof TKeyedArray)
-        ? $array_atomic_type
-        : null;
-
-        if (!$first_arg_array) {
-            return Type::getArray();
-        }
-
-        if ($first_arg_array instanceof TArray) {
-            if ($first_arg_array instanceof TNonEmptyArray) {
-                $first_arg_array = $first_arg_array->setCount(null);
-            }
-
-            return new Union([$first_arg_array]);
-        }
-
-        return new Union([$first_arg_array->getGenericArrayType()]);
-    }
-}
diff --git a/stubs/CoreGenericFunctions.phpstub b/stubs/CoreGenericFunctions.phpstub
index bffe59a41a8..c72fa03ffa6 100644
--- a/stubs/CoreGenericFunctions.phpstub
+++ b/stubs/CoreGenericFunctions.phpstub
@@ -129,6 +129,20 @@ function array_flip(array $array)
 {
 }
 
+/**
+ * @psalm-template TKey as array-key
+ * @psalm-template TValue
+ * @psalm-template TArray as array<TKey, TValue>
+ *
+ * @param TArray $array
+ *
+ * @return (TArray is non-empty-array ? non-empty-array<TKey, TValue> : array<TKey, TValue>)
+ * @psalm-pure
+ */
+function array_unique(array $array, int $flags = 0)
+{
+}
+
 /**
  * @psalm-template TKey as array-key
  * @psalm-template TArray as array<TKey, mixed>
diff --git a/tests/ArrayFunctionCallTest.php b/tests/ArrayFunctionCallTest.php
index af57d042028..bab65c90b32 100644
--- a/tests/ArrayFunctionCallTest.php
+++ b/tests/ArrayFunctionCallTest.php
@@ -2536,6 +2536,19 @@ function consumeArray(array $_input): void {}
                     consumeArray([makeKey() => null]);
                     ',
             ],
+            'arrayUniquePreservesNonEmptyInput' => [
+                'code' => '<?php
+                    /** @param non-empty-array<string, object> $input */
+                    function takes_non_empty_array(array $input): void {}
+
+                    takes_non_empty_array(array_unique(["test" => (object)[]]));
+
+                    /** @param non-empty-array<int, object> $input */
+                    function takes_non_empty_int_array(array $input): void {}
+
+                    takes_non_empty_int_array(array_unique([(object)[]]));
+                ',
+            ],
         ];
     }
 
@@ -2809,6 +2822,24 @@ function merger(array $a, array $b) : array {
                 ',
                 'error_message' => 'NamedArgumentNotAllowed',
             ],
+            'arrayUniquePreservesEmptyInput' => [
+                'code' => '<?php
+                    /** @param non-empty-array<string, object> $input */
+                    function takes_non_empty_array(array $input): void {}
+
+                    takes_non_empty_array(array_unique([]));
+                ',
+                'error_message' => 'InvalidArgument',
+            ],
+            'arrayUniqueConvertsListToArray' => [
+                'code' => '<?php
+                    /** @param non-empty-list<object> $input */
+                    function takes_non_empty_list(array $input): void {}
+
+                    takes_non_empty_list(array_unique([(object)[]]));
+                ',
+                'error_message' => 'ArgumentTypeCoercion',
+            ],
         ];
     }
 }