diff --git a/.gitignore b/.gitignore
index 039afea6..a73932c0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,5 @@ build
 composer.lock
 docs/_site
 vendor
-/nbproject/private/
\ No newline at end of file
+/nbproject/private/
+.php_cs.cache
diff --git a/src/AbstractCsv.php b/src/AbstractCsv.php
index 101dcbe1..b2594b82 100644
--- a/src/AbstractCsv.php
+++ b/src/AbstractCsv.php
@@ -117,7 +117,7 @@ public function __clone()
      *
      * @return static
      */
-    public static function createFromFileObject(SplFileObject $file): self
+    public static function createFromFileObject(SplFileObject $file)
     {
         return new static($file);
     }
@@ -129,7 +129,7 @@ public static function createFromFileObject(SplFileObject $file): self
      *
      * @return static
      */
-    public static function createFromStream($stream): self
+    public static function createFromStream($stream)
     {
         return new static(new Stream($stream));
     }
@@ -141,7 +141,7 @@ public static function createFromStream($stream): self
      *
      * @return static
      */
-    public static function createFromString(string $content): self
+    public static function createFromString(string $content)
     {
         return new static(Stream::createFromString($content));
     }
@@ -155,7 +155,7 @@ public static function createFromString(string $content): self
      *
      * @return static
      */
-    public static function createFromPath(string $path, string $open_mode = 'r+', $context = null): self
+    public static function createFromPath(string $path, string $open_mode = 'r+', $context = null)
     {
         return new static(Stream::createFromPath($path, $open_mode, $context));
     }
diff --git a/src/Reader.php b/src/Reader.php
index 087ce90a..727520c5 100644
--- a/src/Reader.php
+++ b/src/Reader.php
@@ -64,7 +64,7 @@ class Reader extends AbstractCsv implements Countable, IteratorAggregate, JsonSe
     /**
      * {@inheritdoc}
      */
-    public static function createFromPath(string $path, string $open_mode = 'r', $context = null): AbstractCsv
+    public static function createFromPath(string $path, string $open_mode = 'r', $context = null)
     {
         return new static(Stream::createFromPath($path, $open_mode, $context));
     }
diff --git a/src/Stream.php b/src/Stream.php
index ec4968d9..20338a2e 100644
--- a/src/Stream.php
+++ b/src/Stream.php
@@ -167,7 +167,7 @@ public function __debugInfo()
      *
      * @return static
      */
-    public static function createFromPath(string $path, string $open_mode = 'r', $context = null): self
+    public static function createFromPath(string $path, string $open_mode = 'r', $context = null)
     {
         $args = [$path, $open_mode];
         if (null !== $context) {
@@ -192,7 +192,7 @@ public static function createFromPath(string $path, string $open_mode = 'r', $co
      *
      * @return static
      */
-    public static function createFromString(string $content): self
+    public static function createFromString(string $content)
     {
         $resource = fopen('php://temp', 'r+');
         fwrite($resource, $content);