diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
index b71d4dadb5f3f..d1775b797f2b8 100644
--- a/src/Symfony/Component/Process/Process.php
+++ b/src/Symfony/Component/Process/Process.php
@@ -1643,12 +1643,12 @@ private function escapeArgument(?string $argument): string
 
     private function replacePlaceholders(string $commandline, array $env)
     {
-        return preg_replace_callback('/"\$([_a-zA-Z]++[_a-zA-Z0-9]*+)"/', function ($matches) use ($commandline, $env) {
+        return preg_replace_callback('/"\$\{:([_a-zA-Z]++[_a-zA-Z0-9]*+)\}"/', function ($matches) use ($commandline, $env) {
             if (!isset($env[$matches[1]]) || false === $env[$matches[1]]) {
-                throw new InvalidArgumentException(sprintf('Command line is missing a value for key %s: %s.', $matches[0], $commandline));
+                throw new InvalidArgumentException(sprintf('Command line is missing a value for parameter "%s": %s.', $matches[1], $commandline));
             }
 
-            return '\\' === \DIRECTORY_SEPARATOR ? $this->escapeArgument($env[$matches[1]]) : $matches[0];
+            return $this->escapeArgument($env[$matches[1]]);
         }, $commandline);
     }
 
diff --git a/src/Symfony/Component/Process/Tests/ProcessTest.php b/src/Symfony/Component/Process/Tests/ProcessTest.php
index b29e1ec1e9a69..b2138d6864ce4 100644
--- a/src/Symfony/Component/Process/Tests/ProcessTest.php
+++ b/src/Symfony/Component/Process/Tests/ProcessTest.php
@@ -1463,7 +1463,7 @@ public function provideEscapeArgument()
 
     public function testPreparedCommand()
     {
-        $p = Process::fromShellCommandline('echo "$abc"DEF');
+        $p = Process::fromShellCommandline('echo "${:abc}"DEF');
         $p->run(null, ['abc' => 'ABC']);
 
         $this->assertSame('ABCDEF', rtrim($p->getOutput()));
@@ -1471,7 +1471,7 @@ public function testPreparedCommand()
 
     public function testPreparedCommandMulti()
     {
-        $p = Process::fromShellCommandline('echo "$abc""$def"');
+        $p = Process::fromShellCommandline('echo "${:abc}""${:def}"');
         $p->run(null, ['abc' => 'ABC', 'def' => 'DEF']);
 
         $this->assertSame('ABCDEF', rtrim($p->getOutput()));
@@ -1479,7 +1479,7 @@ public function testPreparedCommandMulti()
 
     public function testPreparedCommandWithQuoteInIt()
     {
-        $p = Process::fromShellCommandline('php -r "$code" "$def"');
+        $p = Process::fromShellCommandline('php -r "${:code}" "${:def}"');
         $p->run(null, ['code' => 'echo $argv[1];', 'def' => '"DEF"']);
 
         $this->assertSame('"DEF"', rtrim($p->getOutput()));
@@ -1488,16 +1488,16 @@ public function testPreparedCommandWithQuoteInIt()
     public function testPreparedCommandWithMissingValue()
     {
         $this->expectException('Symfony\Component\Process\Exception\InvalidArgumentException');
-        $this->expectExceptionMessage('Command line is missing a value for key "$abc": echo "$abc".');
-        $p = Process::fromShellCommandline('echo "$abc"');
+        $this->expectExceptionMessage('Command line is missing a value for parameter "abc": echo "${:abc}".');
+        $p = Process::fromShellCommandline('echo "${:abc}"');
         $p->run(null, ['bcd' => 'BCD']);
     }
 
     public function testPreparedCommandWithNoValues()
     {
         $this->expectException('Symfony\Component\Process\Exception\InvalidArgumentException');
-        $this->expectExceptionMessage('Command line is missing a value for key "$abc": echo "$abc".');
-        $p = Process::fromShellCommandline('echo "$abc"');
+        $this->expectExceptionMessage('Command line is missing a value for parameter "abc": echo "${:abc}".');
+        $p = Process::fromShellCommandline('echo "${:abc}"');
         $p->run(null, []);
     }