diff --git a/Extractor/ReflectionExtractor.php b/Extractor/ReflectionExtractor.php
index 3306946..cbcb349 100644
--- a/Extractor/ReflectionExtractor.php
+++ b/Extractor/ReflectionExtractor.php
@@ -187,26 +187,26 @@ private function extractFromMutator($class, $property)
             $type = $this->extractFromReflectionType($reflectionType, $reflectionMethod);
 
             // HHVM reports variadics with "array" but not builtin type hints
-            if (!$reflectionType->isBuiltin() && Type::BUILTIN_TYPE_ARRAY === $type->getBuiltinType()) {
+            if (1 === \count($type) && !$reflectionType->isBuiltin() && Type::BUILTIN_TYPE_ARRAY === $type[0]->getBuiltinType()) {
                 return null;
             }
         } elseif (preg_match('/^(?:[^ ]++ ){4}([a-zA-Z_\x7F-\xFF][^ ]++)/', $reflectionParameter, $info)) {
             if (Type::BUILTIN_TYPE_ARRAY === $info[1]) {
-                $type = new Type(Type::BUILTIN_TYPE_ARRAY, $reflectionParameter->allowsNull(), null, true);
+                $type = [new Type(Type::BUILTIN_TYPE_ARRAY, $reflectionParameter->allowsNull(), null, true)];
             } elseif (Type::BUILTIN_TYPE_CALLABLE === $info[1]) {
-                $type = new Type(Type::BUILTIN_TYPE_CALLABLE, $reflectionParameter->allowsNull());
+                $type = [new Type(Type::BUILTIN_TYPE_CALLABLE, $reflectionParameter->allowsNull())];
             } else {
-                $type = new Type(Type::BUILTIN_TYPE_OBJECT, $reflectionParameter->allowsNull(), $this->resolveTypeName($info[1], $reflectionMethod));
+                $type = [new Type(Type::BUILTIN_TYPE_OBJECT, $reflectionParameter->allowsNull(), $this->resolveTypeName($info[1], $reflectionMethod))];
             }
         } else {
             return null;
         }
 
-        if (\in_array($prefix, $this->arrayMutatorPrefixes)) {
-            $type = new Type(Type::BUILTIN_TYPE_ARRAY, false, null, true, new Type(Type::BUILTIN_TYPE_INT), $type);
+        if (1 === \count($type) && \in_array($prefix, $this->arrayMutatorPrefixes)) {
+            $type = [new Type(Type::BUILTIN_TYPE_ARRAY, false, null, true, new Type(Type::BUILTIN_TYPE_INT), $type[0])];
         }
 
-        return [$type];
+        return $type;
     }
 
     /**
@@ -225,7 +225,7 @@ private function extractFromAccessor($class, $property)
         }
 
         if ($this->supportsParameterType && $reflectionType = $reflectionMethod->getReturnType()) {
-            return [$this->extractFromReflectionType($reflectionType, $reflectionMethod)];
+            return $this->extractFromReflectionType($reflectionType, $reflectionMethod);
         }
 
         return \in_array($prefix, ['is', 'can']) ? [new Type(Type::BUILTIN_TYPE_BOOL)] : null;
@@ -234,24 +234,28 @@ private function extractFromAccessor($class, $property)
     /**
      * Extracts data from the PHP 7 reflection type.
      *
-     * @return Type
+     * @return Type[]
      */
     private function extractFromReflectionType(\ReflectionType $reflectionType, \ReflectionMethod $reflectionMethod)
     {
-        $phpTypeOrClass = $reflectionType instanceof \ReflectionNamedType ? $reflectionType->getName() : $reflectionType->__toString();
+        $types = [];
         $nullable = $reflectionType->allowsNull();
 
-        if (Type::BUILTIN_TYPE_ARRAY === $phpTypeOrClass) {
-            $type = new Type(Type::BUILTIN_TYPE_ARRAY, $nullable, null, true);
-        } elseif ('void' === $phpTypeOrClass) {
-            $type = new Type(Type::BUILTIN_TYPE_NULL, $nullable);
-        } elseif ($reflectionType->isBuiltin()) {
-            $type = new Type($phpTypeOrClass, $nullable);
-        } else {
-            $type = new Type(Type::BUILTIN_TYPE_OBJECT, $nullable, $this->resolveTypeName($phpTypeOrClass, $reflectionMethod));
+        foreach ($reflectionType instanceof \ReflectionUnionType ? $reflectionType->getTypes() : [$reflectionType] as $type) {
+            $phpTypeOrClass = $reflectionType instanceof \ReflectionNamedType ? $reflectionType->getName() : (string) $type;
+
+            if (Type::BUILTIN_TYPE_ARRAY === $phpTypeOrClass) {
+                $types[] = new Type(Type::BUILTIN_TYPE_ARRAY, $nullable, null, true);
+            } elseif ('void' === $phpTypeOrClass || 'null' === $phpTypeOrClass) {
+                $types[] = new Type(Type::BUILTIN_TYPE_NULL, $nullable);
+            } elseif ($reflectionType->isBuiltin()) {
+                $types[] = new Type($phpTypeOrClass, $nullable);
+            } else {
+                $types[] = new Type(Type::BUILTIN_TYPE_OBJECT, $nullable, $this->resolveTypeName($phpTypeOrClass, $reflectionMethod));
+            }
         }
 
-        return $type;
+        return $types;
     }
 
     private function resolveTypeName($name, \ReflectionMethod $reflectionMethod)