diff --git a/phpseclib/File/ANSI.php b/phpseclib/File/ANSI.php
index 07624d60..6c42ef1f 100644
--- a/phpseclib/File/ANSI.php
+++ b/phpseclib/File/ANSI.php
@@ -419,7 +419,7 @@ class ANSI
 
                     if ($this->x > $this->max_x) {
                         $this->x = 0;
-                        $this->y++;
+                        $this->newLine();
                     } else {
                         $this->x++;
                     }
diff --git a/tests/Unit/File/ANSITest.php b/tests/Unit/File/ANSITest.php
index 3f6e607e..5f356e11 100644
--- a/tests/Unit/File/ANSITest.php
+++ b/tests/Unit/File/ANSITest.php
@@ -44,4 +44,22 @@ class Unit_File_ANSITest extends PhpseclibTestCase
 
         $this->assertSame($ansi->getScreen(), $expected);
     }
-}
+
+    public function testLineOverflow()
+    {
+        $str = '';
+        foreach (range('a', 'y') as $char) {
+            $str.= "$char\r\n";
+        }
+        $str.= str_repeat('z', 100);
+
+        $ansi = new ANSI();
+        $ansi->appendString($str);
+
+        $screen = $ansi->getScreen();
+
+        $lines = explode("\r\n", $screen);
+        $this->assertSame(24, count($lines));
+        $this->assertSame(str_repeat('z', 80), $lines[22]);
+    }
+}
\ No newline at end of file