diff --git a/src/JsonSchema/Uri/Retrievers/Curl.php b/src/JsonSchema/Uri/Retrievers/Curl.php
index 311f1d34..6387e253 100644
--- a/src/JsonSchema/Uri/Retrievers/Curl.php
+++ b/src/JsonSchema/Uri/Retrievers/Curl.php
@@ -76,7 +76,7 @@ private function fetchMessageBody($response)
      */
     protected function fetchContentType($response)
     {
-        if (0 < preg_match("/Content-Type:(\V*)/ims", $response, $match)) {
+        if (0 < preg_match('/^Content-Type:([^;\v]*)/im', $response, $match)) {
             $this->contentType = trim($match[1]);
 
             return true;
diff --git a/src/JsonSchema/Uri/Retrievers/FileGetContents.php b/src/JsonSchema/Uri/Retrievers/FileGetContents.php
index f6056693..84598c3e 100644
--- a/src/JsonSchema/Uri/Retrievers/FileGetContents.php
+++ b/src/JsonSchema/Uri/Retrievers/FileGetContents.php
@@ -97,7 +97,7 @@ private function fetchContentType(array $headers): bool
      */
     protected static function getContentTypeMatchInHeader($header)
     {
-        if (0 < preg_match("/Content-Type:(\V*)/ims", $header, $match)) {
+        if (0 < preg_match('/^Content-Type:([^;\v]*)/im', $header, $match)) {
             return trim($match[1]);
         }
 
diff --git a/tests/Uri/Retrievers/CurlTest.php b/tests/Uri/Retrievers/CurlTest.php
index c2c88067..d47cace6 100644
--- a/tests/Uri/Retrievers/CurlTest.php
+++ b/tests/Uri/Retrievers/CurlTest.php
@@ -34,6 +34,34 @@ public function testNoContentType(): void
 
             self::assertStringEqualsFileCanonicalizing(realpath(__DIR__ . '/../../fixtures/foobar.json'), $result);
         }
+
+        /**
+         * @dataProvider contentTypeProvider
+         */
+        public function testFetchContentType(string $response, ?string $expected, bool $matches): void
+        {
+            $c = new Curl();
+
+            $reflector = new \ReflectionObject($c);
+            $fetchContentType = $reflector->getMethod('fetchContentType');
+            if (PHP_VERSION_ID < 80100) {
+                $fetchContentType->setAccessible(true);
+            }
+
+            $this->assertSame($matches, $fetchContentType->invoke($c, $response));
+            $this->assertSame($expected, $c->getContentType());
+        }
+
+        public function contentTypeProvider(): array
+        {
+            return [
+                'json without parameters' => ["Content-Type: application/json\r\n\r\n{}", 'application/json', true],
+                'json with charset' => ["Content-Type: application/json; charset=utf-8\r\n\r\n{}", 'application/json', true],
+                'schema media type with charset' => ["Content-Type: application/schema+json; charset=utf-8\r\n\r\n{}", 'application/schema+json', true],
+                'multiple parameters' => ["Content-Type: application/json; charset=utf-8; profile=schema\r\n\r\n{}", 'application/json', true],
+                'X-Content-Type is not a content type' => ["HTTP/1.1 200 OK\r\nX-Content-Type: text/plain\r\n\r\n{}", null, false],
+            ];
+        }
     }
 }
 
diff --git a/tests/Uri/Retrievers/FileGetContentsTest.php b/tests/Uri/Retrievers/FileGetContentsTest.php
index 70effd7c..88d60aa2 100644
--- a/tests/Uri/Retrievers/FileGetContentsTest.php
+++ b/tests/Uri/Retrievers/FileGetContentsTest.php
@@ -25,7 +25,10 @@ public function testFetchFile(): void
         $this->assertNotEmpty($result);
     }
 
-    public function testContentType(): void
+    /**
+     * @dataProvider contentTypeProvider
+     */
+    public function testFetchContentType(string $header, ?string $expected, bool $matches): void
     {
         $res = new FileGetContents();
 
@@ -35,8 +38,20 @@ public function testContentType(): void
             $fetchContentType->setAccessible(true);
         }
 
-        $this->assertTrue($fetchContentType->invoke($res, ['Content-Type: application/json']));
-        $this->assertFalse($fetchContentType->invoke($res, ['X-Some-Header: whateverValue']));
+        $this->assertSame($matches, $fetchContentType->invoke($res, [$header]));
+        $this->assertSame($expected, $res->getContentType());
+    }
+
+    public function contentTypeProvider(): array
+    {
+        return [
+            'json without parameters' => ['Content-Type: application/json', 'application/json', true],
+            'json with charset' => ['Content-Type: application/json; charset=utf-8', 'application/json', true],
+            'schema media type with charset' => ['Content-Type: application/schema+json; charset=utf-8', 'application/schema+json', true],
+            'multiple parameters' => ['Content-Type: application/json; charset=utf-8; profile=schema', 'application/json', true],
+            'non-content-type header' => ['X-Some-Header: whateverValue', null, false],
+            'X-Content-Type is not a content type' => ['X-Content-Type: text/plain', null, false],
+        ];
     }
 
     public function testCanHandleHttp301PermanentRedirect(): void