diff --git a/Tests/xdiffTest.php b/Tests/xdiffTest.php
index c349d88..9c2907b 100644
--- a/Tests/xdiffTest.php
+++ b/Tests/xdiffTest.php
@@ -155,12 +155,27 @@ to this document.
 
   public function test_diff_normal_5  ()
   {
-    // Mode normal
     $xdiff = new xdiff ();
     $res = $xdiff->diff ("\n", "\n");
     $this->assertSame ($res, "");
   }
 
+  public function test_diff_normal_6  ()
+  {
+    $xdiff = new xdiff ();
+    $res = $xdiff->diff ("\n", "");
+    $this->assertSame ($res, "1d0
+< \n");
+  }
+
+  public function test_diff_normal_7  ()
+  {
+    $xdiff = new xdiff ();
+    $res = $xdiff->diff ("", "\n");
+    $this->assertSame ($res, "0a1
+> \n");
+  }
+
   public function test_diff_unified_1  ()
   {
     // Mode unified
@@ -255,4 +270,24 @@ to this document.
     $this->assertSame ($res, "");
   }
 
+  public function test_diff_unified_6  ()
+  {
+    $xdiff = new xdiff ("unified");
+    $res = $xdiff->diff ("\n", "");
+    $this->assertSame ($res, "--- Original ".date ("Y-m-d H:i:s.u000 O")."
++++ New ".date ("Y-m-d H:i:s.u001 O")."
+@@ -1 +0,0 @@
+-\n");
+  }
+
+  public function test_diff_unified_7  ()
+  {
+    $xdiff = new xdiff ("unified");
+    $res = $xdiff->diff ("", "\n");
+    $this->assertSame ($res, "--- Original ".date ("Y-m-d H:i:s.u000 O")."
++++ New ".date ("Y-m-d H:i:s.u001 O")."
+@@ -0,0 +1 @@
++\n");
+  }
+
 }
diff --git a/xdiff.php b/xdiff.php
index 8f9e885..9510618 100644
--- a/xdiff.php
+++ b/xdiff.php
@@ -285,7 +285,8 @@ class xdiff
         $info .= ",0";
         $info .= " +";
         $info .= $diff["startLine2"];
-        $info .= ",".$diff["length"];
+        if ($diff["length"] !== 1)
+          $info .= ",".$diff["length"];
         $info .= " @@\n";
         $d .= $info;
         $d .= "+".implode ("+", $diff["chunk"]);
@@ -294,7 +295,8 @@ class xdiff
       {
         $info = "@@ -";
         $info .= $diff["startLine1"];
-        $info .= ",".$diff["length"];
+        if ($diff["length"] !== 1)
+          $info .= ",".$diff["length"];
         $info .= " +";
         $info .= $diff["startLine2"];
         $info .= ",0";