diff --git a/lib/private/helper.php b/lib/private/helper.php
index 29ecd85388..f329d53fa7 100644
--- a/lib/private/helper.php
+++ b/lib/private/helper.php
@@ -346,17 +346,6 @@ class OC_Helper {
 		return \OC::$server->getMimeTypeDetector()->detectPath($path);
 	}
 
-	/**
-	 * get the mimetype form a data string
-	 *
-	 * @param string $data
-	 * @return string
-	 * @deprecated 8.2.0 Use \OC::$server->getMimeTypeDetector()->detectString($data)
-	 */
-	static function getStringMimeType($data) {
-		return \OC::$server->getMimeTypeDetector()->detectString($data);
-	}
-
 	/**
 	 * detect if a given program is found in the search PATH
 	 *
diff --git a/tests/lib/helper.php b/tests/lib/helper.php
index 576209df06..114354c793 100644
--- a/tests/lib/helper.php
+++ b/tests/lib/helper.php
@@ -71,16 +71,6 @@ class Test_Helper extends \Test\TestCase {
 		];
 	}
 
-	function testGetStringMimeType() {
-		if (\OC_Util::runningOnWindows()) {
-			$this->markTestSkipped('[Windows] Strings have mimetype application/octet-stream on Windows');
-		}
-
-		$result = OC_Helper::getStringMimeType("/data/data.tar.gz");
-		$expected = 'text/plain; charset=us-ascii';
-		$this->assertEquals($result, $expected);
-	}
-
 	function testIsSubDirectory() {
 		$result = OC_Helper::isSubDirectory("./data/", "/anotherDirectory/");
 		$this->assertFalse($result);