diff --git a/src/Common/ExecTrait.php b/src/Common/ExecTrait.php
index 6b380361..9959d304 100644
--- a/src/Common/ExecTrait.php
+++ b/src/Common/ExecTrait.php
@@ -374,11 +374,6 @@ protected function execute($process, $output_callback = null)
         }
 
         if (isset($this->env)) {
-            // Symfony 4 will inherit environment variables by default, but until
-            // then, manually ensure they are inherited.
-            if (method_exists($this->process, 'inheritEnvironmentVariables')) {
-                $this->process->inheritEnvironmentVariables();
-            }
             $this->process->setEnv($this->env);
         }
 
diff --git a/tests/integration/ExecTest.php b/tests/integration/ExecTest.php
index ab2791a6..64c616c4 100644
--- a/tests/integration/ExecTest.php
+++ b/tests/integration/ExecTest.php
@@ -56,13 +56,6 @@ public function testMultipleEnvVars()
 
     public function testInheritEnv()
     {
-        // Symfony < 3.2.1 does not inherit environment variables, so there's
-        // nothing to test if the function doesn't exist.
-        if (!method_exists('Symfony\Component\Process\Process', 'inheritEnvironmentVariables')) {
-            $this->markTestSkipped(
-                'Inheriting of environment variables is not supported.'
-            );
-        }
         // With no environment variables set, count how many environment
         // variables are present.
         $task = $this->taskExec('env | wc -l')->interactive(false);