diff --git a/ChangeLog-7.4.md b/ChangeLog-7.4.md
index 38de33d8257..6c76518d3a7 100644
--- a/ChangeLog-7.4.md
+++ b/ChangeLog-7.4.md
@@ -7,6 +7,7 @@ All notable changes of the PHPUnit 7.4 release series are documented in this fil
 ### Fixed
 
 * Fixed [#3379](https://github.com/sebastianbergmann/phpunit/issues/3379): Dependent test of skipped test has status `-1`
+* Fixed [#3394](https://github.com/sebastianbergmann/phpunit/issues/3394): Process Isolation does not work when PHPUnit is used as PHAR
 
 ## [7.4.3] - 2018-10-23
 
diff --git a/build/binary-phar-autoload.php.in b/build/binary-phar-autoload.php.in
index cab03d3f929..e65915726f8 100644
--- a/build/binary-phar-autoload.php.in
+++ b/build/binary-phar-autoload.php.in
@@ -40,18 +40,16 @@ Phar::mapPhar('___PHAR___');
 
 ___FILELIST___
 
-if (!$execute) {
-    exit;
-}
-
-if (isset($printManifest)) {
-    print file_get_contents(__PHPUNIT_PHAR_ROOT__ . '/manifest.txt');
+if ($execute) {
+    if (isset($printManifest)) {
+        print file_get_contents(__PHPUNIT_PHAR_ROOT__ . '/manifest.txt');
 
-    exit;
-}
+        exit;
+    }
 
-unset($execute);
+    unset($execute);
 
-PHPUnit\TextUI\Command::main();
+    PHPUnit\TextUI\Command::main();
+}
 
 __HALT_COMPILER();