diff --git a/eng/build.ps1 b/eng/build.ps1
index c45165068d6e2..e243d6ff74c80 100644
--- a/eng/build.ps1
+++ b/eng/build.ps1
@@ -437,7 +437,7 @@ function TestUsingRunTests() {
     $args += " --collectdumps";
   }
 
-  if ($test64) {
+  if ($test64 -or $testVsi) {
     $args += " --platform x64"
   }
   else {