diff --git a/Dotenv.php b/Dotenv.php
index 57128b4..8180f4b 100644
--- a/Dotenv.php
+++ b/Dotenv.php
@@ -136,8 +136,12 @@ public function populate(array $values, bool $overrideExistingVars = false): voi
 
         foreach ($values as $name => $value) {
             $notHttpName = 0 !== strpos($name, 'HTTP_');
+            if (isset($_SERVER[$name]) && $notHttpName && !isset($_ENV[$name])) {
+                $_ENV[$name] = $_SERVER[$name];
+            }
+
             // don't check existence with getenv() because of thread safety issues
-            if (!isset($loadedVars[$name]) && (!$overrideExistingVars && (isset($_ENV[$name]) || (isset($_SERVER[$name]) && $notHttpName)))) {
+            if (!isset($loadedVars[$name]) && !$overrideExistingVars && isset($_ENV[$name])) {
                 continue;
             }
 
diff --git a/Tests/DotenvTest.php b/Tests/DotenvTest.php
index 4428658..62494e4 100644
--- a/Tests/DotenvTest.php
+++ b/Tests/DotenvTest.php
@@ -493,4 +493,14 @@ public function testDoNotUsePutenv()
         $this->assertSame('no', $_ENV['TEST_USE_PUTENV']);
         $this->assertFalse(getenv('TEST_USE_PUTENV'));
     }
+
+    public function testSERVERVarsDuplicationInENV()
+    {
+        unset($_ENV['SYMFONY_DOTENV_VARS'], $_SERVER['SYMFONY_DOTENV_VARS'], $_ENV['FOO']);
+        $_SERVER['FOO'] = 'CCC';
+
+        (new Dotenv(false))->populate(['FOO' => 'BAR']);
+
+        $this->assertSame('CCC', $_ENV['FOO']);
+    }
 }