diff --git a/src/Analyser/TypeSpecifier.php b/src/Analyser/TypeSpecifier.php
index 37a2646a45e..ef69051f2ad 100644
--- a/src/Analyser/TypeSpecifier.php
+++ b/src/Analyser/TypeSpecifier.php
@@ -31,6 +31,8 @@
 use PHPStan\Type\Accessory\HasOffsetType;
 use PHPStan\Type\Accessory\HasPropertyType;
 use PHPStan\Type\Accessory\NonEmptyArrayType;
+use PHPStan\Type\ArrayType;
+use PHPStan\Type\BooleanType;
 use PHPStan\Type\ConditionalTypeForParameter;
 use PHPStan\Type\Constant\ConstantArrayTypeBuilder;
 use PHPStan\Type\Constant\ConstantBooleanType;
@@ -54,9 +56,11 @@
 use PHPStan\Type\NullType;
 use PHPStan\Type\ObjectType;
 use PHPStan\Type\ObjectWithoutClassType;
+use PHPStan\Type\ResourceType;
 use PHPStan\Type\StaticMethodTypeSpecifyingExtension;
 use PHPStan\Type\StaticType;
 use PHPStan\Type\StaticTypeFactory;
+use PHPStan\Type\StringType;
 use PHPStan\Type\Type;
 use PHPStan\Type\TypeCombinator;
 use PHPStan\Type\TypeTraverser;
@@ -1076,7 +1080,31 @@ private function specifyTypesForConstantStringBinaryExpression(
 			&& strtolower($exprNode->name->toString()) === 'gettype'
 			&& isset($exprNode->getArgs()[0])
 		) {
-			$type = GetTypeHelper::typeFromString($constantType->getValue());
+			$type = null;
+			if ($constantType->getValue() === 'string') {
+				$type = new StringType();
+			}
+			if ($constantType->getValue() === 'array') {
+				$type = new ArrayType(new MixedType(), new MixedType());
+			}
+			if ($constantType->getValue() === 'boolean') {
+				$type = new BooleanType();
+			}
+			if ($constantType->getValue() === 'resource' || $constantType->getValue() === 'resource (closed)') {
+				$type = new ResourceType();
+			}
+			if ($constantType->getValue() === 'integer') {
+				$type = new IntegerType();
+			}
+			if ($constantType->getValue() === 'double') {
+				$type = new FloatType();
+			}
+			if ($constantType->getValue() === 'NULL') {
+				$type = new NullType();
+			}
+			if ($constantType->getValue() === 'object') {
+				$type = new ObjectWithoutClassType();
+			}
 
 			if ($type !== null) {
 				return $this->create($exprNode->getArgs()[0]->value, $type, $context, false, $scope, $rootExpr);
diff --git a/src/Reflection/InitializerExprTypeResolver.php b/src/Reflection/InitializerExprTypeResolver.php
index ab4f202de24..295053eeca9 100644
--- a/src/Reflection/InitializerExprTypeResolver.php
+++ b/src/Reflection/InitializerExprTypeResolver.php
@@ -6,6 +6,8 @@
 use PhpParser\Node\Expr;
 use PhpParser\Node\Expr\Array_;
 use PhpParser\Node\Expr\BinaryOp;
+use PhpParser\Node\Expr\ClassConstFetch;
+use PhpParser\Node\Expr\ConstFetch;
 use PhpParser\Node\Identifier;
 use PhpParser\Node\Name;
 use PhpParser\Node\Scalar\DNumber;
@@ -105,7 +107,7 @@ public function getType(Expr $expr, InitializerExprContext $context): Type
 		if ($expr instanceof String_) {
 			return new ConstantStringType($expr->value);
 		}
-		if ($expr instanceof Expr\ConstFetch) {
+		if ($expr instanceof ConstFetch) {
 			$constName = (string) $expr->name;
 			$loweredConstName = strtolower($constName);
 			if ($loweredConstName === 'true') {
@@ -157,7 +159,7 @@ public function getType(Expr $expr, InitializerExprContext $context): Type
 			$dim = $this->getType($expr->dim, $context);
 			return $var->getOffsetValueType($dim);
 		}
-		if ($expr instanceof Expr\ClassConstFetch && $expr->name instanceof Identifier) {
+		if ($expr instanceof ClassConstFetch && $expr->name instanceof Identifier) {
 			return $this->getClassConstFetchType($expr->class, $expr->name->toString(), $context->getClassName(), fn (Expr $expr): Type => $this->getType($expr, $context));
 		}
 		if ($expr instanceof Expr\UnaryPlus) {
@@ -538,7 +540,7 @@ private function builtDegradedConstantArray(Array_ $node, callable $getTypeCallb
 				$isList = false;
 
 				$itemKeyType = $getTypeCallback($key);
-				if (!$itemKeyType instanceof ConstantScalarType) {
+				if (!$itemKeyType instanceof ConstantScalarType || $key instanceof ClassConstFetch) {
 					throw new OversizedConstantArrayTypeException();
 				}
 				if (!$itemKeyType->isNonEmptyString()->yes()) {
@@ -557,7 +559,7 @@ private function builtDegradedConstantArray(Array_ $node, callable $getTypeCallb
 			}
 
 			$itemValueType = $getTypeCallback($value);
-			if (!$itemValueType instanceof ConstantScalarType) {
+			if (!$itemValueType instanceof ConstantScalarType || $value instanceof ClassConstFetch) {
 				throw new OversizedConstantArrayTypeException();
 			}
 			if (!$itemValueType->isNonEmptyString()->yes()) {