diff --git a/appveyor.yml b/appveyor.yml
index 8acdabb9..2acd8b7b 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -32,3 +32,6 @@ deploy:
     skip_symbols: true
     on:
       branch: master
+
+# For PRs, skip the branch run and only run against the virtual PR merge.
+skip_branch_with_pr: true