diff --git a/tracer/build/_build/docker/iis.multipleappsindomain.dockerfile b/tracer/build/_build/docker/iis.multipleappsindomain.dockerfile
index bd32b402295e..cfef028c729e 100644
--- a/tracer/build/_build/docker/iis.multipleappsindomain.dockerfile
+++ b/tracer/build/_build/docker/iis.multipleappsindomain.dockerfile
@@ -20,9 +20,9 @@ RUN c:\Windows\System32\inetsrv\appcmd add apppool /name:mutliAppPool /managedRu
 RUN Remove-WebSite -Name 'Default Web Site'; \
     Write-Host "Created app pool with 32 bit reg key: $env:ENABLE_32_BIT"; \
     Write-Host "Creating multi app domain sites"; \
-    [System.Environment]::SetEnvironmentVariable("DD_TRACE_AGENT_URL", "http://test-agent.windows:8126", [System.EnvironmentVariableTarget]::Machine); \
-    [System.Environment]::SetEnvironmentVariable("DD_TRACE_AGENT_URL", "http://test-agent.windows:8126", [System.EnvironmentVariableTarget]::Process); \
-    [System.Environment]::SetEnvironmentVariable("DD_TRACE_AGENT_URL", "http://test-agent.windows:8126", [System.EnvironmentVariableTarget]::User); \
+    [System.Environment]::SetEnvironmentVariable('DD_TRACE_AGENT_URL', 'http://test-agent.windows:8126', [System.EnvironmentVariableTarget]::Machine); \
+    [System.Environment]::SetEnvironmentVariable('DD_TRACE_AGENT_URL', 'http://test-agent.windows:8126', [System.EnvironmentVariableTarget]::Process); \
+    [System.Environment]::SetEnvironmentVariable('DD_TRACE_AGENT_URL', 'http://test-agent.windows:8126', [System.EnvironmentVariableTarget]::User); \
     New-Website -Name 'MultiAppPoolWithCustomConfig1' -ApplicationPool mutliAppPool -Port 8081 -PhysicalPath 'c:\MultipleAppsInDomain';
 
 # TEMP Set LoaderOptimization flag to see if we can read env vars now