diff --git a/src/main/scala/gitbucket/core/view/helpers.scala b/src/main/scala/gitbucket/core/view/helpers.scala
index 221b750..6284248 100644
--- a/src/main/scala/gitbucket/core/view/helpers.scala
+++ b/src/main/scala/gitbucket/core/view/helpers.scala
@@ -5,7 +5,7 @@
 
 import gitbucket.core.controller.Context
 import gitbucket.core.model.CommitState
-import gitbucket.core.plugin.{RenderRequest, PluginRegistry, Renderer}
+import gitbucket.core.plugin.{RenderRequest, PluginRegistry}
 import gitbucket.core.service.{RepositoryService, RequestCache}
 import gitbucket.core.util.{FileUtil, JGitUtil, StringUtil}
 
diff --git a/src/main/twirl/gitbucket/core/helper/checkicon.scala.html b/src/main/twirl/gitbucket/core/helper/checkicon.scala.html
index 32a0c5a..b9726a7 100644
--- a/src/main/twirl/gitbucket/core/helper/checkicon.scala.html
+++ b/src/main/twirl/gitbucket/core/helper/checkicon.scala.html
@@ -1,6 +1,6 @@
 @(condition: => Boolean)
 @if(condition){
-  <i class="octicon octicon-check active"></i>
+  <i class="icon-ok"></i>
 } else {
-  <i class="octicon"></i>
+  <i class="icon-white"></i>
 }
\ No newline at end of file
diff --git a/src/main/twirl/gitbucket/core/pulls/compare.scala.html b/src/main/twirl/gitbucket/core/pulls/compare.scala.html
index bf00b94..2b728fd 100644
--- a/src/main/twirl/gitbucket/core/pulls/compare.scala.html
+++ b/src/main/twirl/gitbucket/core/pulls/compare.scala.html
@@ -139,7 +139,7 @@
   }
 
   @if(hasWritePermission){
-    function checkConflict(from, to, noConflictHandler, hasConflictHandler){
+    function checkConflict(from, to){
       $('.check-conflict').show();
       $.get('@url(repository)/compare/' + from + '...' + to + '/mergecheck',
         function(data){ $('.check-conflict').html(data); });
diff --git a/src/main/twirl/gitbucket/core/repo/branches.scala.html b/src/main/twirl/gitbucket/core/repo/branches.scala.html
index 40d353c..7b4eded 100644
--- a/src/main/twirl/gitbucket/core/repo/branches.scala.html
+++ b/src/main/twirl/gitbucket/core/repo/branches.scala.html
@@ -30,9 +30,17 @@
                   }
                 }.getOrElse{
                   @if(context.loginAccount.isDefined){
-                    <a href="@url(repository)/compare/@{encodeRefName(repository.repository.defaultBranch)}...@{encodeRefName(branch.name)}?expand=1" class="btn btn-small">New Pull Request</a>
+                    <a href="@url(repository)/compare/@{repository.repository.parentUserName.map { parent =>
+                      urlEncode(parent) + ":" + encodeRefName(repository.repository.defaultBranch)
+                    }.getOrElse {
+                      encodeRefName(repository.repository.defaultBranch)
+                    }}...@{encodeRefName(branch.name)}?expand=1" class="btn btn-small">New Pull Request</a>
                   }else{
-                    <a href="@url(repository)/compare/@{encodeRefName(repository.repository.defaultBranch)}...@{encodeRefName(branch.name)}" class="btn btn-small">Compare</a>
+                    <a href="@url(repository)/compare/@{repository.repository.parentUserName.map { parent =>
+                      urlEncode(parent) + ":" + encodeRefName(repository.repository.defaultBranch)
+                    }.getOrElse {
+                      encodeRefName(repository.repository.defaultBranch)
+                    }}...@{encodeRefName(branch.name)}" class="btn btn-small">Compare</a>
                   }
                 }
                 @if(hasWritePermission){
diff --git a/src/test/scala/gitbucket/core/view/HelpersSpec.scala b/src/test/scala/gitbucket/core/view/HelpersSpec.scala
new file mode 100644
index 0000000..b323393
--- /dev/null
+++ b/src/test/scala/gitbucket/core/view/HelpersSpec.scala
@@ -0,0 +1,51 @@
+package gitbucket.core.view
+
+import org.specs2.mutable._
+import gitbucket.core.model.Repository
+import java.util.Date
+
+class HelpersSpec extends Specification {
+  def repository(defaultBranch: String, parentUserName: Option[String]) =
+    Repository(
+      userName = "some-user",
+      repositoryName = "some-repo",
+      isPrivate = false,
+      description = None,
+      defaultBranch = defaultBranch,
+      parentUserName = parentUserName,
+      parentRepositoryName = Some("some-repo"),
+      registeredDate = new Date(),
+      updatedDate = new Date(),
+      lastActivityDate = new Date(),
+      originUserName = Some("some-other-user"),
+      originRepositoryName = Some("some-repo")
+    )
+
+  "repositoryDefaultCompareOrigin" should {
+    "return default branch when not fork" in {
+      val repo = repository("master", None)
+
+      helpers.repositoryDefaultCompareOrigin(repo) mustEqual "master"
+    }
+
+    "return [upstream]:[branch] when a fork" in {
+      val repo = repository("some-branch", Some("parent-user"))
+
+      helpers.repositoryDefaultCompareOrigin(repo) mustEqual "parent-user:some-branch"
+    }
+  }
+
+  "encodeCompareBranch" should {
+    "not uri encode /" in {
+      helpers.encodeCompareBranch("foo/bar#baz") mustEqual "foo/bar%23baz"
+    }
+
+    "not uri encode :" in {
+      helpers.encodeCompareBranch("foo:bar#baz") mustEqual "foo:bar%23baz"
+    }
+
+    "uri encode special characters" in {
+      helpers.encodeCompareBranch("!#$&'()+,;=?@[]") mustEqual "%21%23%24%26%27%28%29%2B%2C%3B%3D%3F%40%5B%5D"
+    }
+  }
+}