diff --git a/phpseclib/Crypt/EC/Formats/Signature/IEEE.php b/phpseclib/Crypt/EC/Formats/Signature/IEEE.php
index 7c34a24f..26ff7404 100644
--- a/phpseclib/Crypt/EC/Formats/Signature/IEEE.php
+++ b/phpseclib/Crypt/EC/Formats/Signature/IEEE.php
@@ -54,13 +54,15 @@ abstract class IEEE
      *
      * @param \phpseclib3\Math\BigInteger $r
      * @param \phpseclib3\Math\BigInteger $s
+     * @param string $curve
+     * @param int $length
      * @return string
      */
-    public static function save(BigInteger $r, BigInteger $s, $curve)
+    public static function save(BigInteger $r, BigInteger $s, $curve, $length)
     {
         $r = $r->toBytes();
         $s = $s->toBytes();
-        $len = $curve->getLength();
-        return str_pad($r, $len, "\0", STR_PAD_LEFT) . str_pad($s, $len, "\0", STR_PAD_LEFT);
+        $length >>= 3;
+        return str_pad($r, $length, "\0", STR_PAD_LEFT) . str_pad($s, $length, "\0", STR_PAD_LEFT);
     }
 }
diff --git a/phpseclib/Crypt/EC/PrivateKey.php b/phpseclib/Crypt/EC/PrivateKey.php
index 96884c76..611921cc 100644
--- a/phpseclib/Crypt/EC/PrivateKey.php
+++ b/phpseclib/Crypt/EC/PrivateKey.php
@@ -266,11 +266,10 @@ final class PrivateKey extends EC implements Common\PrivateKey
         $temp = new \ReflectionMethod($format, 'save');
         $paramCount = $temp->getNumberOfRequiredParameters();
 
-        if ($paramCount == 2) {
-            return $format::save($r, $s);
-        }
-        if ($paramCount == 3) {
-            return $format::save($r, $s, $this->getCurve());
+        switch ($paramCount) {
+            case 2: return $format::save($r, $s);
+            case 3: return $format::save($r, $s, $this->getCurve());
+            case 4: return $format::save($r, $s, $this->getCurve(), $this->getLength());
         }
 
         // presumably the only way you could get to this is if you were using a custom plugin
diff --git a/tests/Unit/Crypt/EC/KeyTest.php b/tests/Unit/Crypt/EC/KeyTest.php
index 83ea2e8d..0a73c104 100644
--- a/tests/Unit/Crypt/EC/KeyTest.php
+++ b/tests/Unit/Crypt/EC/KeyTest.php
@@ -747,4 +747,18 @@ z9DYTLdGkQDqox3AtEs9nn6kE1O/vHE4bqMegjj4gbA=
         $key = EC::loadFormat('PKCS8', $key);
         $this->assertInstanceOf(PublicKey::class, $key);
     }
+
+    public function testIEEESignatureCreate()
+    {
+        $key = PublicKeyLoader::load('-----BEGIN PRIVATE KEY-----
+MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQg7+qVCtyt+tV2hTou
+kbZNIHu+PaE0osExnxdlkiC+VYqhRANCAAS8yEueJvIAnCk++0rsD8X9dk3hAmyb
+4lv6WkjCQU5iksxIG/E60L8IeDZX8+oNzHPjNN5/6MBk0ISrGKyFhlH1
+-----END PRIVATE KEY-----');
+
+        $priv = $key->withSignatureFormat('IEEE');
+        $sig = $priv->sign('ddd');
+
+        $this->assertTrue($key->getPublicKey()->withSignatureFormat('IEEE')->verify('ddd', $sig));
+    }
 }