diff --git a/appveyor.yml b/appveyor.yml
index c2cd078201..9e17c95901 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -24,7 +24,7 @@ matrix:
 
 environment:
   COVERALLS_REPO_TOKEN:
-  secure: UQiSUNs39uWy45YG1iS9hatwF5ouX0Q2c
+  secure: 1hvfHFO3qtGTcwB+AnCGYsn0az0j9MzAux5hee5CFeyRJ+lWut0LjnyqvsI/5Pfa
 
 #---------------------------------#
 #       build configuration       #
@@ -35,7 +35,6 @@ before_build:
   - ps: Import-Module .\build\psake.psm1
 
 build_script:
-  - ps: Invoke-Psake .\build\build.ps1 -properties @{"BuildNumber"=$env:APPVEYOR_BUILD_NUMBER}
 
 #---------------------------------#
 #       tests configuration       #
diff --git a/build/build.ps1 b/build/build.ps1
index 37c532ab56..f09c5b9c04 100644
--- a/build/build.ps1
+++ b/build/build.ps1
@@ -5,6 +5,7 @@ Properties {
 	
 	# see appveyor.yml for usage
 	$BuildNumber = $null
+	$IsAppVeyor = $null
 	
 	# Input and output paths
 	$BUILD_PATH = Resolve-Path "."
@@ -23,7 +24,7 @@ Properties {
 	$NUGET_EXE = Join-Path $SRC_PATH ".nuget\NuGet.exe"
 	$NUNIT_EXE = Join-Path $SRC_PATH "packages\NUnit.Runners.2.6.3\tools\nunit-console.exe"
 	$COVERALLS_EXE = Join-Path $SRC_PATH "packages\coveralls.io.1.3.2\tools\coveralls.net.exe"
-	$OPENCOVER_EXE = Join-Path $SRC_PATH "packages\OpenCover.4.5.3207\OpenCover.Console.exe"
+	$OPENCOVER_EXE = Join-Path $SRC_PATH "packages\OpenCover.4.5.3809-rc94\OpenCover.Console.exe"
 	$REPORTGEN_EXE = Join-Path $SRC_PATH "packages\ReportGenerator.1.9.1.0\ReportGenerator.exe"
 	$NUNITREPORT_EXE = Join-Path $BUILD_PATH "tools\NUnitHTMLReportGenerator.exe"
 	
@@ -152,15 +153,22 @@ task Run-Coverage -depends Build-Tests {
 		$TestDdlPath = Join-Path $TestDllFolder "$_.dll"
 		$CoverageOutputPath = Join-Path $TEST_RESULTS "$($_)_Coverage.xml"
 		
+	    $appVeyor = ""
+	    if ($IsAppVeyor) {
+	        $appVeyor = " -appveyor"
+	    }
+
 		Write-Host "Running code coverage on project $_"
 		$coverageFilter = "-filter:+[*]* -[FluentAssertions*]* -[ImageProcessor]*Common.Exceptions -[ImageProcessor.UnitTests]* -[ImageProcessor.Web.UnitTests]*"
-		& $OPENCOVER_EXE -register:user -target:$NUNIT_EXE -targetargs:"$TestDdlPath /noshadow /nologo" -targetdir:$TestDllFolder -output:$CoverageOutputPath $coverageFilter
+		& $OPENCOVER_EXE -threshold:1 -oldstyle -register:user -target:$NUNIT_EXE -targetargs:"$TestDdlPath /noshadow /nologo" $appVeyor -targetdir:$TestDllFolder -output:$CoverageOutputPath $coverageFilter
 		
 		Write-Host "Transforming coverage results file to HTML"
-		& $REPORTGEN_EXE -reports:$CoverageOutputPath -targetdir:(Join-Path $TEST_RESULTS "Coverage\$_")
+		& $REPORTGEN_EXE -verbosity:Info -reports:$CoverageOutputPath -targetdir:(Join-Path $TEST_RESULTS "Coverage\$_")
 
-		Write-Host "Uploading coverage report to Coveralls.io"
-        Exec { . $COVERALLS_EXE --opencover $CoverageOutputPath }
+	    if ($env:COVERALLS_REPO_TOKEN -ne $null) {
+			Write-Host "Uploading coverage report to Coveralls.io"
+	        Exec { . $COVERALLS_EXE --opencover $CoverageOutputPath }
+	    }
 	}
 }
 
diff --git a/build/coverage.bat b/build/coverage.bat
index 16cb3e6d6a..f27ef1d495 100644
--- a/build/coverage.bat
+++ b/build/coverage.bat
@@ -1,3 +1,5 @@
 @echo off
 
-powershell "Import-Module %~dp0\psake.psm1 ; Invoke-Psake %~dp0\build.ps1 Run-Coverage ; exit $LASTEXITCODE"
\ No newline at end of file
+powershell "Import-Module %~dp0\psake.psm1 ; Invoke-Psake %~dp0\build.ps1 Run-Coverage ; exit $LASTEXITCODE"
+
+pause
\ No newline at end of file
diff --git a/src/.nuget/packages.config b/src/.nuget/packages.config
index 232098461c..aaa9ef5a04 100644
--- a/src/.nuget/packages.config
+++ b/src/.nuget/packages.config
@@ -2,6 +2,6 @@
 <packages>
   <package id="coveralls.io" version="1.3.2" />
   <package id="NUnit.Runners" version="2.6.3" />
-  <package id="OpenCover" version="4.5.3207" />
+  <package id="OpenCover" version="4.5.3809-rc94" />
   <package id="ReportGenerator" version="1.9.1.0" />
 </packages>
\ No newline at end of file