diff --git a/appveyor-windows-binary.yml b/appveyor-windows-binary.yml
index cffd9f2639..6e8a95bde3 100644
--- a/appveyor-windows-binary.yml
+++ b/appveyor-windows-binary.yml
@@ -138,7 +138,7 @@ install:
   - ps: "
     Invoke-WebRequest -Uri https://github.com/aws/aws-sam-cli/releases/download/sam-cli-nightly/AWS_SAM_CLI_64_PY3.msi -OutFile aws-sam-cli-installer.msi;
     Start-Process 'C:\\Windows\\System32\\msiexec.exe' -ArgumentList '/i aws-sam-cli-installer.msi /qn /norestart' -wait -PassThru;
-    Rename-Item -Path 'C:\Program Files\Amazon\AWSSAMCLI_NIGHTLY\bin\sam-nightly.cmd' -NewName 'C:\Program Files\Amazon\AWSSAMCLI_NIGHTLY\bin\sam.cmd'
+    Rename-Item -Path 'C:\\Program Files\\Amazon\\AWSSAMCLI_NIGHTLY\\bin\\sam-nightly.cmd' -NewName 'C:\\Program Files\\Amazon\\AWSSAMCLI_NIGHTLY\\bin\\sam.cmd'
   "
   - 'set PATH=C:\Program Files\Amazon\AWSSAMCLI\bin\;%PATH%'
   - 'sam --version'