diff --git a/eng/Build.ps1 b/eng/Build.ps1
index b911d1de0d1..18987e6488c 100644
--- a/eng/Build.ps1
+++ b/eng/Build.ps1
@@ -186,7 +186,7 @@ function Update-Arguments() {
             $script:bootstrap = $True
         }
     } else {
-        if (-Not (Test-Path "$ArtifactsDir\Bootstrap\fsc\fsc.dll") -or (Test-Path "$ArtifactsDir\Bootstrap\fsc\fsc.runtimeconfig.json")) {
+        if (-Not (Test-Path "$ArtifactsDir\Bootstrap\fsc\fsc.exe") -or (Test-Path "$ArtifactsDir\Bootstrap\fsc\fsc.runtimeconfig.json")) {
             $script:bootstrap = $True
         }
     }