diff --git a/src/Validator/DocumentValidator.php b/src/Validator/DocumentValidator.php
index 6a1ba94..0364839 100644
--- a/src/Validator/DocumentValidator.php
+++ b/src/Validator/DocumentValidator.php
@@ -53,7 +53,6 @@ use function count;
 use function implode;
 use function is_array;
 use function sprintf;
-use const PHP_EOL;
 
 /**
  * Implements the "Validation" section of the spec.
@@ -316,7 +315,7 @@ class DocumentValidator
         if (count($errors) !== 0) {
             throw new Error(
                 implode(
-                    PHP_EOL . PHP_EOL,
+                    "\n\n",
                     array_map(static function (Error $error) : string {
                         return $error->message;
                     }, $errors)
diff --git a/tests/Executor/ValuesTest.php b/tests/Executor/ValuesTest.php
index b0bc05a..7aa85d2 100644
--- a/tests/Executor/ValuesTest.php
+++ b/tests/Executor/ValuesTest.php
@@ -15,7 +15,6 @@ use GraphQL\Type\Schema;
 use PHPUnit\Framework\TestCase;
 use function count;
 use function var_export;
-use const PHP_EOL;
 
 class ValuesTest extends TestCase
 {
@@ -37,7 +36,7 @@ class ValuesTest extends TestCase
         self::assertEquals(
             $variables,
             $this->runTestCase($variables)['coerced'],
-            'Output variables did not match input variables' . PHP_EOL . var_export($variables, true) . PHP_EOL
+            'Output variables did not match input variables' . "\n" . var_export($variables, true) . "\n"
         );
     }
 
diff --git a/tests/Utils/SchemaExtenderTest.php b/tests/Utils/SchemaExtenderTest.php
index 552cc29..0df0c4c 100644
--- a/tests/Utils/SchemaExtenderTest.php
+++ b/tests/Utils/SchemaExtenderTest.php
@@ -38,7 +38,6 @@ use function iterator_to_array;
 use function preg_match;
 use function preg_replace;
 use function trim;
-use const PHP_EOL;
 
 class SchemaExtenderTest extends TestCase
 {
@@ -1844,9 +1843,9 @@ class SchemaExtenderTest extends TestCase
                 extend schema @foo
             '),
             implode(
-                PHP_EOL,
+                "\n",
                 array_map(static function ($node) {
-                    return Printer::doPrint($node) . PHP_EOL;
+                    return Printer::doPrint($node) . "\n";
                 }, $nodes)
             )
         );