diff --git a/src/Symfony/Component/Dotenv/Dotenv.php b/src/Symfony/Component/Dotenv/Dotenv.php
index de40ade592d2e..81bb08810eaac 100644
--- a/src/Symfony/Component/Dotenv/Dotenv.php
+++ b/src/Symfony/Component/Dotenv/Dotenv.php
@@ -466,7 +466,7 @@ private function resolveVariables(string $value, array $loadedVars): string
$value = '';
}
- if ('' === $value && isset($matches['default_value'])) {
+ if ('' === $value && isset($matches['default_value']) && '' !== $matches['default_value']) {
$unsupportedChars = strpbrk($matches['default_value'], '\'"{$');
if (false !== $unsupportedChars) {
throw $this->createFormatException(sprintf('Unsupported character "%s" found in the default value of variable "$%s".', $unsupportedChars[0], $name));
diff --git a/src/Symfony/Component/Dotenv/Tests/DotenvTest.php b/src/Symfony/Component/Dotenv/Tests/DotenvTest.php
index 3f232698aebf7..d4c7c53dcd2ba 100644
--- a/src/Symfony/Component/Dotenv/Tests/DotenvTest.php
+++ b/src/Symfony/Component/Dotenv/Tests/DotenvTest.php
@@ -172,6 +172,7 @@ public function getEnvData()
["FOO=BAR\nBAR=\${NOTDEFINED:=TEST}", ['FOO' => 'BAR', 'NOTDEFINED' => 'TEST', 'BAR' => 'TEST']],
["FOO=\nBAR=\${FOO:=TEST}", ['FOO' => 'TEST', 'BAR' => 'TEST']],
["FOO=\nBAR=\$FOO:=TEST}", ['FOO' => 'TEST', 'BAR' => 'TEST}']],
+ ["FOO=foo\nFOOBAR=\${FOO}\${BAR}", ['FOO' => 'foo', 'FOOBAR' => 'foo']],
];
if ('\\' !== \DIRECTORY_SEPARATOR) {
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