diff --git a/phpseclib/Net/SFTP.php b/phpseclib/Net/SFTP.php
index 72d461ea..a148152d 100644
--- a/phpseclib/Net/SFTP.php
+++ b/phpseclib/Net/SFTP.php
@@ -1060,28 +1060,6 @@ class SFTP extends SSH2
         }
     }
 
-    /**
-     * Returns the file size, in bytes, or false, on failure
-     *
-     * Files larger than 4GB will show up as being exactly 4GB.
-     *
-     * @param string $filename
-     * @return mixed
-     * @access public
-     */
-    public function size($filename)
-    {
-        if (!($this->bitmap & SSH2::MASK_LOGIN)) {
-            return false;
-        }
-
-        $result = $this->stat($filename);
-        if ($result === false) {
-            return false;
-        }
-        return isset($result['size']) ? $result['size'] : -1;
-    }
-
     /**
      * Save files / directories to cache
      *
diff --git a/phpseclib/Net/SFTP/Stream.php b/phpseclib/Net/SFTP/Stream.php
index 4136301e..a892b6f9 100644
--- a/phpseclib/Net/SFTP/Stream.php
+++ b/phpseclib/Net/SFTP/Stream.php
@@ -266,7 +266,7 @@ class Stream
         }
         $this->path = $path;
 
-        $this->size = $this->sftp->size($path);
+        $this->size = $this->sftp->filesize($path);
         $this->mode = preg_replace('#[bt]$#', '', $mode);
         $this->eof = false;
 
diff --git a/tests/Functional/Net/SFTPLargeFileTest.php b/tests/Functional/Net/SFTPLargeFileTest.php
index d661f76a..718426b0 100644
--- a/tests/Functional/Net/SFTPLargeFileTest.php
+++ b/tests/Functional/Net/SFTPLargeFileTest.php
@@ -36,7 +36,7 @@ class Functional_Net_SFTPLargeFileTest extends Functional_Net_SFTPTestCase
 
         $this->assertSame(
             128 * 1024 * 1024,
-            $this->sftp->size($filename),
+            $this->sftp->filesize($filename),
             'Failed asserting that uploaded local file has the expected length.'
         );
     }
diff --git a/tests/Functional/Net/SFTPStreamTest.php b/tests/Functional/Net/SFTPStreamTest.php
index aad4189e..e24e85f5 100644
--- a/tests/Functional/Net/SFTPStreamTest.php
+++ b/tests/Functional/Net/SFTPStreamTest.php
@@ -24,7 +24,7 @@ class Functional_Net_SFTPStreamTest extends Functional_Net_SFTPTestCase
         $fp = fopen($this->buildUrl('fooo.txt'), 'wb', false, $context);
         $this->assertInternalType('resource', $fp);
         fclose($fp);
-        $this->assertSame(0, $this->sftp->size('fooo.txt'));
+        $this->assertSame(0, $this->sftp->filesize('fooo.txt'));
     }
 
     /**
diff --git a/tests/Functional/Net/SFTPUserStoryTest.php b/tests/Functional/Net/SFTPUserStoryTest.php
index 530e8a25..56c76fe5 100644
--- a/tests/Functional/Net/SFTPUserStoryTest.php
+++ b/tests/Functional/Net/SFTPUserStoryTest.php
@@ -148,7 +148,7 @@ class Functional_Net_SFTPUserStoryTest extends PhpseclibFunctionalTestCase
 
         $this->assertSame(
             self::$exampleDataLength,
-            $sftp->size('file1.txt'),
+            $sftp->filesize('file1.txt'),
             'Failed asserting that put example data has the expected length'
         );
 
@@ -184,7 +184,7 @@ class Functional_Net_SFTPUserStoryTest extends PhpseclibFunctionalTestCase
 
         $this->assertSame(
             self::$exampleDataLength,
-            $sftp->size('file1.txt'),
+            $sftp->filesize('file1.txt'),
             'Failed asserting that put example data has the expected length'
         );
 
@@ -232,7 +232,7 @@ class Functional_Net_SFTPUserStoryTest extends PhpseclibFunctionalTestCase
 
         $this->assertSame(
             1024 * 1024,
-            $sftp->size('file3.txt'),
+            $sftp->filesize('file3.txt'),
             'Failed asserting that truncate()\'d file has the expected length'
         );
 
@@ -352,7 +352,7 @@ class Functional_Net_SFTPUserStoryTest extends PhpseclibFunctionalTestCase
         $last_size = 0x7FFFFFFF;
         foreach ($files as $file) {
             if ($sftp->is_file($file)) {
-                $cur_size = $sftp->size($file);
+                $cur_size = $sftp->filesize($file);
                 $this->assertLessThanOrEqual(
                     $last_size,
                     $cur_size,
@@ -547,7 +547,7 @@ class Functional_Net_SFTPUserStoryTest extends PhpseclibFunctionalTestCase
         $filename = 'file-large-from-truncate-4112MiB.txt';
         $this->assertTrue($sftp->touch($filename));
         $this->assertTrue($sftp->truncate($filename, $filesize));
-        $this->assertSame($filesize, $sftp->size($filename));
+        $this->assertSame($filesize, $sftp->filesize($filename));
 
         return $sftp;
     }