diff --git a/src/Type/Php/InArrayFunctionTypeSpecifyingExtension.php b/src/Type/Php/InArrayFunctionTypeSpecifyingExtension.php
index 62c022c8e1..997cfea752 100644
--- a/src/Type/Php/InArrayFunctionTypeSpecifyingExtension.php
+++ b/src/Type/Php/InArrayFunctionTypeSpecifyingExtension.php
@@ -110,7 +110,9 @@ public function specifyTypes(FunctionReflection $functionReflection, FuncCall $n
 			$context->true()
 			|| (
 				$context->false()
-				&& count($arrayValueType->getFiniteTypes()) === 1
+				&& count($arrayValueType->getFiniteTypes()) > 0
+				&& count($needleType->getFiniteTypes()) > 0
+				&& $arrayType->isIterableAtLeastOnce()->yes()
 			)
 		) {
 			$specifiedTypes = $this->typeSpecifier->create(
diff --git a/tests/PHPStan/Analyser/nsrt/enum-in-array.php b/tests/PHPStan/Analyser/nsrt/enum-in-array.php
new file mode 100644
index 0000000000..ca34261bc8
--- /dev/null
+++ b/tests/PHPStan/Analyser/nsrt/enum-in-array.php
@@ -0,0 +1,187 @@
+<?php // lint >= 8.1
+
+use function PHPStan\Testing\assertType;
+
+enum MyEnum: string
+{
+
+	case A = 'a';
+	case B = 'b';
+	case C = 'c';
+
+	const SET_AB = [self::A, self::B];
+	const SET_C = [self::C];
+	const SET_ABC = [self::A, self::B, self::C];
+
+	public function test1(): void
+	{
+		foreach (self::cases() as $enum) {
+			if (in_array($enum, MyEnum::SET_AB, true)) {
+				assertType('MyEnum::A|MyEnum::B', $enum);
+			} elseif (in_array($enum, MyEnum::SET_C, true)) {
+				assertType('MyEnum::C', $enum);
+			} else {
+				assertType('*NEVER*', $enum);
+			}
+		}
+	}
+
+	public function test2(): void
+	{
+		foreach (self::cases() as $enum) {
+			if (in_array($enum, MyEnum::SET_ABC, true)) {
+				assertType('MyEnum::A|MyEnum::B|MyEnum::C', $enum);
+			} else {
+				assertType('*NEVER*', $enum);
+			}
+		}
+	}
+
+	public function test3(): void
+	{
+		foreach (self::cases() as $enum) {
+			if (in_array($enum, MyEnum::SET_C, true)) {
+				assertType('MyEnum::C', $enum);
+			} else {
+				assertType('MyEnum::A|MyEnum::B', $enum);
+			}
+		}
+	}
+
+	public function test4(): void
+	{
+		foreach ([MyEnum::C] as $enum) {
+			if (in_array($enum, MyEnum::SET_C, true)) {
+				assertType('MyEnum::C', $enum);
+			} else {
+				assertType('*NEVER*', $enum);
+			}
+		}
+	}
+
+	public function testNegative1(): void
+	{
+		foreach (self::cases() as $enum) {
+			if (!in_array($enum, MyEnum::SET_AB, true)) {
+				assertType('MyEnum::C', $enum);
+			} else {
+				assertType('MyEnum::A|MyEnum::B', $enum);
+			}
+		}
+	}
+
+	public function testNegative2(): void
+	{
+		foreach (self::cases() as $enum) {
+			if (!in_array($enum, MyEnum::SET_AB, true)) {
+				assertType('MyEnum::C', $enum);
+			} elseif (!in_array($enum, MyEnum::SET_AB, true)) {
+				assertType('*NEVER*', $enum);
+			}
+		}
+	}
+
+	public function testNegative3(): void
+	{
+		foreach ([MyEnum::C] as $enum) {
+			if (!in_array($enum, MyEnum::SET_C, true)) {
+				assertType('*NEVER*', $enum);
+			}
+		}
+	}
+
+	/**
+	 * @param array<MyEnum|null> $array
+	 */
+	public function testNegative4(MyEnum $enum, array $array): void
+	{
+		if (!in_array($enum, $array, true)) {
+			assertType('MyEnum', $enum);
+			assertType('array<MyEnum|null>', $array);
+		} else {
+			assertType('MyEnum', $enum);
+			assertType('non-empty-array<MyEnum|null>', $array);
+		}
+	}
+
+}
+
+class InArrayEnum
+{
+
+	/** @param list<MyEnum> $list */
+	public function testPositive(MyEnum $enum, array $list): void
+	{
+		if (in_array($enum, $list, true)) {
+			return;
+		}
+
+		assertType(MyEnum::class, $enum);
+		assertType('list<MyEnum>', $list);
+	}
+
+	/** @param list<MyEnum> $list */
+	public function testNegative(MyEnum $enum, array $list): void
+	{
+		if (!in_array($enum, $list, true)) {
+			return;
+		}
+
+		assertType(MyEnum::class, $enum);
+		assertType('non-empty-list<MyEnum>', $list);
+	}
+
+}
+
+
+class InArrayOtherFiniteType {
+
+	const SET_AB = ['a', 'b'];
+	const SET_C = ['c'];
+	const SET_ABC = ['a', 'b', 'c'];
+
+	public function test1(): void
+	{
+		foreach (['a', 'b', 'c'] as $item) {
+			if (in_array($item, self::SET_AB, true)) {
+				assertType("'a'|'b'", $item);
+			} elseif (in_array($item, self::SET_C, true)) {
+				assertType("'c'", $item);
+			} else {
+				assertType('*NEVER*', $item);
+			}
+		}
+	}
+
+	public function test2(): void
+	{
+		foreach (['a', 'b', 'c'] as $item) {
+			if (in_array($item, self::SET_ABC, true)) {
+				assertType("'a'|'b'|'c'", $item);
+			} else {
+				assertType('*NEVER*', $item);
+			}
+		}
+	}
+
+	public function test3(): void
+	{
+		foreach (['a', 'b', 'c'] as $item) {
+			if (in_array($item, self::SET_C, true)) {
+				assertType("'c'", $item);
+			} else {
+				assertType("'a'|'b'", $item);
+			}
+		}
+	}
+	public function test4(): void
+	{
+		foreach (['c'] as $item) {
+			if (in_array($item, self::SET_C, true)) {
+				assertType("'c'", $item);
+			} else {
+				assertType('*NEVER*', $item);
+			}
+		}
+	}
+}