diff --git a/appveyor.yml b/appveyor.yml
index 97aafe35..29ad77d2 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -15,11 +15,18 @@ cache:
   - 'graalvm -> appveyor.yml'
 
 clone_script:
-  - cmd: >-
-      git clone -q --branch=%APPVEYOR_REPO_BRANCH% https://github.com/%APPVEYOR_REPO_NAME%.git %APPVEYOR_BUILD_FOLDER%
-      && cd %APPVEYOR_BUILD_FOLDER%
-      && git checkout -qf %APPVEYOR_REPO_COMMIT%
-      && git submodule update --init --recursive
+- ps: >-
+    if(-not $env:APPVEYOR_PULL_REQUEST_NUMBER) {
+      git clone -q --branch=$env:APPVEYOR_REPO_BRANCH https://github.com/$env:APPVEYOR_REPO_NAME.git $env:APPVEYOR_BUILD_FOLDER
+      cd $env:APPVEYOR_BUILD_FOLDER
+      git checkout -qf $env:APPVEYOR_REPO_COMMIT
+    } else {
+      git clone -q https://github.com/$env:APPVEYOR_REPO_NAME.git $env:APPVEYOR_BUILD_FOLDER
+      cd $env:APPVEYOR_BUILD_FOLDER
+      git fetch -q origin +refs/pull/$env:APPVEYOR_PULL_REQUEST_NUMBER/merge:
+      git checkout -qf FETCH_HEAD
+    }
+- cmd: git submodule update --init --recursive
 
 build_script:
 - cmd: >-
diff --git a/sci b/sci
index 33bc0b0a..01625017 160000
--- a/sci
+++ b/sci
@@ -1 +1 @@
-Subproject commit 33bc0b0a14d3f9d95ad9ecf9f1b29e95527153a3
+Subproject commit 01625017d5734eab8716db98f07f2253883a197e