diff --git a/src/QirRuntime/prerequisites.ps1 b/src/QirRuntime/prerequisites.ps1
index 43a7337012f..72ae1b5079c 100644
--- a/src/QirRuntime/prerequisites.ps1
+++ b/src/QirRuntime/prerequisites.ps1
@@ -2,10 +2,11 @@
 # Licensed under the MIT License.
 
 if ($Env:ENABLE_QIRRUNTIME -ne "false") {
-    if (($IsWindows) -or ((Test-Path Env:AGENT_OS) -and ($Env:AGENT_OS.StartsWith("Win"))) -and
-    !(Get-Command clang -ErrorAction SilentlyContinue)) {
-        choco install llvm
-        choco install ninja
+    if (($IsWindows) -or ((Test-Path Env:AGENT_OS) -and ($Env:AGENT_OS.StartsWith("Win")))) {
+        if (!(Get-Command clang -ErrorAction SilentlyContinue)) {
+            choco install llvm
+            choco install ninja
+        }
     } elseif ($IsMacOS) {
         brew install ninja
     } else {