diff --git a/src/Symfony/Component/Yaml/Parser.php b/src/Symfony/Component/Yaml/Parser.php
index 94af06cc3fd85..8e0bc86c8323a 100644
--- a/src/Symfony/Component/Yaml/Parser.php
+++ b/src/Symfony/Component/Yaml/Parser.php
@@ -36,6 +36,7 @@ class Parser
     private $skippedLineNumbers = [];
     private $locallySkippedLineNumbers = [];
     private $refsBeingParsed = [];
+    private $openMappingCount = 0;
 
     /**
      * Parses a YAML file into a PHP value.
@@ -1208,18 +1209,12 @@ private function lexInlineMapping(string $yaml): string
         if ('' === $yaml || '{' !== $yaml[0]) {
             throw new \InvalidArgumentException(sprintf('"%s" is not a sequence.', $yaml));
         }
-
-        for ($i = 1; isset($yaml[$i]) && '}' !== $yaml[$i]; ++$i) {
-        }
-
-        if (isset($yaml[$i]) && '}' === $yaml[$i]) {
-            return $yaml;
-        }
-
-        $lines = [$yaml];
-
-        while ($this->moveToNextLine()) {
-            $lines[] = $this->currentLine;
+        $this->openMappingCount = 0;
+        $lines = [
+            $this->calculateLineOpenMappings($yaml),
+        ];
+        while (!$this->allMappingIsClosed() && $this->moveToNextLine()) {
+            $lines[] = $this->calculateLineOpenMappings($this->currentLine);
         }
 
         return implode("\n", $lines);
@@ -1253,4 +1248,23 @@ private function lexInlineSequence(string $yaml): string
 
         return $value;
     }
+
+    private function allMappingIsClosed(): bool
+    {
+        return 0 === $this->openMappingCount;
+    }
+
+    private function calculateLineOpenMappings(string $yamlLine): string
+    {
+        for ($i = 0; isset($yamlLine[$i]); ++$i) {
+            if ('{' === $yamlLine[$i]) {
+                ++$this->openMappingCount;
+            }
+            if ('}' === $yamlLine[$i]) {
+                --$this->openMappingCount;
+            }
+        }
+
+        return trim($yamlLine);
+    }
 }
diff --git a/src/Symfony/Component/Yaml/Tests/ParserTest.php b/src/Symfony/Component/Yaml/Tests/ParserTest.php
index 8d278d91023e1..b83c685321ce3 100644
--- a/src/Symfony/Component/Yaml/Tests/ParserTest.php
+++ b/src/Symfony/Component/Yaml/Tests/ParserTest.php
@@ -2414,6 +2414,46 @@ public function testParseValueWithNegativeModifiers()
             $this->parser->parse($yaml)
         );
     }
+
+    /**
+     * @dataProvider validMappingSequenceProvider
+     */
+    public function testParametersAfterMappingSequence(string $yaml, array $parsed): void
+    {
+        self::assertSame($parsed, $this->parser->parse($yaml));
+    }
+
+    public function validMappingSequenceProvider(): iterable
+    {
+        $expected = [
+            'map' => [
+                'key' => 'value',
+                'a' => 'b',
+            ],
+            'param' => 'some',
+        ];
+        $yaml = <<<YAML
+map: {
+    key: "value",
+    a: "b"
+}
+param: "some"
+YAML;
+        yield 'multiline syntax' => [$yaml, $expected];
+
+        $yaml = <<<YAML
+map: {key: "value", a: "b"}
+param: "some"
+YAML;
+        yield 'inline syntax' => [$yaml, $expected];
+
+        $yaml = <<<YAML
+map: {key: "value",
+a: "b"}
+param: "some"
+YAML;
+        yield 'mixed syntax' => [$yaml, $expected];
+    }
 }
 
 class B