diff --git a/appveyor.yml b/appveyor.yml
index 0b8615c..690273b 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -24,5 +24,8 @@
       OPENSSL64DIR: C:\OpenSSL-v11-Win64
 
 build:
-  # Launch the build using msbuild
+  parallel: true
+  project: picotlsvs\picotlsvs.sln
+
+before_build:
   - ps: misc\build_picotls.ps1
diff --git a/misc/build_picotls.ps1 b/misc/build_picotls.ps1
index b675ea1..0f425d7 100644
--- a/misc/build_picotls.ps1
+++ b/misc/build_picotls.ps1
@@ -7,4 +7,4 @@
     }
 }
 
-msbuild "/p:Configuration=$Env:Configuration" "/p:Platform=$Env:Platform" /m picotlsvs\picotlsvs.sln
+# msbuild "/p:Configuration=$Env:Configuration" "/p:Platform=$Env:Platform" /m picotlsvs\picotlsvs.sln
diff --git a/picotlsvs/picotlsvs.sln b/picotlsvs/picotlsvs.sln
index 6be9680..e6140c4 100644
--- a/picotlsvs/picotlsvs.sln
+++ b/picotlsvs/picotlsvs.sln
@@ -16,6 +16,7 @@
 		{559AC085-1BEF-450A-A62D-0D370561D596} = {559AC085-1BEF-450A-A62D-0D370561D596}
 		{499B82B3-F5A5-4C2E-91EF-A2F77CBC33F5} = {499B82B3-F5A5-4C2E-91EF-A2F77CBC33F5}
 		{56C264BF-822B-4F29-B512-5B26157CA2EC} = {56C264BF-822B-4F29-B512-5B26157CA2EC}
+		{55F22DE6-EAAE-4279-97B7-84FAAB7F29BB} = {55F22DE6-EAAE-4279-97B7-84FAAB7F29BB}
 		{497433FE-B252-4985-A504-54EB791F57F4} = {497433FE-B252-4985-A504-54EB791F57F4}
 	EndProjectSection
 EndProject