diff --git a/lib/public/security/isecurerandom.php b/lib/public/security/isecurerandom.php
index 46d82dd5f1..3de60f8d71 100644
--- a/lib/public/security/isecurerandom.php
+++ b/lib/public/security/isecurerandom.php
@@ -26,7 +26,7 @@ interface ISecureRandom {
 	const CHAR_UPPER = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
 	const CHAR_LOWER = 'abcdefghijklmnopqrstuvwxyz';
 	const CHAR_DIGITS = '0123456789';
-	const CHAR_SYMBOLS = '!\"#$%&\\'()* +,-./:;<=>?@[\]^_`{|}~';
+	const CHAR_SYMBOLS = '!\"#$%&\\\'()* +,-./:;<=>?@[\]^_`{|}~';
 
 	/**
 	 * Convenience method to get a low strength random number generator.