diff --git a/src/Type/ExplicitType.php b/src/Type/ExplicitType.php
index a067fee..397282f 100644
--- a/src/Type/ExplicitType.php
+++ b/src/Type/ExplicitType.php
@@ -3,6 +3,7 @@
 namespace Radebatz\TypeInfoExtras\Type;
 
 use Symfony\Component\TypeInfo\Type;
+use Symfony\Component\TypeInfo\Type\BuiltinType;
 use Symfony\Component\TypeInfo\TypeIdentifier;
 
 /**
@@ -31,6 +32,14 @@ public function getTypeIdentifier(): TypeIdentifier
         return $this->typeIdentifier;
     }
 
+    /**
+     * Get the underlying builtin type.
+     */
+    public function getBuiltinType(): BuiltinType
+    {
+        return Type::builtin($this->typeIdentifier);
+    }
+
     public function getExplicitType(): string
     {
         return $this->explicitType;
diff --git a/src/TypeResolver/ResolverExtrasTrait.php b/src/TypeResolver/ResolverExtrasTrait.php
index 9354e8b..3467774 100644
--- a/src/TypeResolver/ResolverExtrasTrait.php
+++ b/src/TypeResolver/ResolverExtrasTrait.php
@@ -52,4 +52,11 @@ protected function tryAsClassLike(BaseType $type, array $variableTypes): ?ClassL
 
         return null;
     }
+
+    public function reduceToBuiltinType(?BaseType $type)
+    {
+        return $type instanceof ExplicitType
+            ? $type->getBuiltinType()
+            : $type;
+    }
 }
diff --git a/src/TypeResolver/StringTypeResolver.php b/src/TypeResolver/StringTypeResolver.php
index 064a628..d159f64 100644
--- a/src/TypeResolver/StringTypeResolver.php
+++ b/src/TypeResolver/StringTypeResolver.php
@@ -286,7 +286,7 @@ private function getTypeFromNode(TypeNode $node, ?TypeContext $typeContext): Bas
                         throw new \DomainException(\sprintf('"%s" type cannot have a key type defined.', $node->type));
                     }
 
-                    return Type::collection($type, $variableTypes[1], $variableTypes[0], $asList);
+                    return Type::collection($type, $variableTypes[1], $this->reduceToBuiltinType($variableTypes[0]), $asList);
                 }
             }
 
diff --git a/tests/TypeResolver/StringTypeResolverTest.php b/tests/TypeResolver/StringTypeResolverTest.php
index 1e17b04..f594546 100644
--- a/tests/TypeResolver/StringTypeResolverTest.php
+++ b/tests/TypeResolver/StringTypeResolverTest.php
@@ -60,6 +60,7 @@ public static function extrasResolveDataProvider(): iterable
         yield [Type::union(Type::intRange(to: -1), Type::intRange(from: 1)), 'non-zero-int'];
         yield [Type::intRange(0, 100), 'int<0, 100>'];
         yield [Type::intRange(), 'int<min, max>'];
+        yield [Type::array(Type::bool(), Type::int()), 'array<positive-int, bool>'];
 
         yield [Type::explicit(TypeIdentifier::STRING, 'class-string'), 'class-string'];
         yield [Type::classLike('class-string', Type::object(Dummy::class)), sprintf('class-string<%s>', Dummy::class)];