diff --git a/lib/private/allconfig.php b/lib/private/allconfig.php
index a4aa69d43f..de3ac97363 100644
--- a/lib/private/allconfig.php
+++ b/lib/private/allconfig.php
@@ -17,7 +17,7 @@ class AllConfig implements \OCP\IConfig {
 	 * Sets a new system wide value
 	 *
 	 * @param string $key the key of the value, under which will be saved
-	 * @param string $value the value that should be stored
+	 * @param mixed $value the value that should be stored
 	 * @todo need a use case for this
 	 */
 // 	public function setSystemValue($key, $value) {
@@ -28,7 +28,7 @@ class AllConfig implements \OCP\IConfig {
 	 * Looks up a system wide defined value
 	 *
 	 * @param string $key the key of the value, under which it was saved
-	 * @param string $default the default value to be returned if the value isn't set
+	 * @param mixed $default the default value to be returned if the value isn't set
 	 * @return string the saved value
 	 */
 	public function getSystemValue($key, $default = '') {
diff --git a/lib/private/config.php b/lib/private/config.php
index 8a9d5ca615..8399d0defb 100644
--- a/lib/private/config.php
+++ b/lib/private/config.php
@@ -77,7 +77,7 @@ class Config {
 	/**
 	 * @brief Gets a value from config.php
 	 * @param string $key key
-	 * @param string $default = null default value
+	 * @param mixed $default = null default value
 	 * @return string the value or $default
 	 *
 	 * This function gets the value from config.php. If it does not exist,
@@ -94,7 +94,7 @@ class Config {
 	/**
 	 * @brief Sets a value
 	 * @param string $key key
-	 * @param string $value value
+	 * @param mixed $value value
 	 *
 	 * This function sets the value and writes the config.php.
 	 *
diff --git a/lib/public/config.php b/lib/public/config.php
index d9355a0605..c1cc103487 100644
--- a/lib/public/config.php
+++ b/lib/public/config.php
@@ -42,7 +42,7 @@ class Config {
 	/**
 	 * Gets a value from config.php
 	 * @param string $key key
-	 * @param string $default = null default value
+	 * @param mixed $default = null default value
 	 * @return string the value or $default
 	 *
 	 * This function gets the value from config.php. If it does not exist,
@@ -55,7 +55,7 @@ class Config {
 	/**
 	 * Sets a value
 	 * @param string $key key
-	 * @param string $value value
+	 * @param mixed $value value
 	 * @return bool
 	 *
 	 * This function sets the value and writes the config.php. If the file can
diff --git a/lib/public/iconfig.php b/lib/public/iconfig.php
index 1d0f8e0015..585ee2812d 100644
--- a/lib/public/iconfig.php
+++ b/lib/public/iconfig.php
@@ -38,7 +38,7 @@ interface IConfig {
 	 * Sets a new system wide value
 	 *
 	 * @param string $key the key of the value, under which will be saved
-	 * @param string $value the value that should be stored
+	 * @param mixed $value the value that should be stored
 	 * @todo need a use case for this
 	 */
 // 	public function setSystemValue($key, $value);
@@ -47,7 +47,7 @@ interface IConfig {
 	 * Looks up a system wide defined value
 	 *
 	 * @param string $key the key of the value, under which it was saved
-	 * @param string $default the default value to be returned if the value isn't set
+	 * @param mixed $default the default value to be returned if the value isn't set
 	 * @return string the saved value
 	 */
 	public function getSystemValue($key, $default = '');