diff --git a/src/scripts/win32.ps1 b/src/scripts/win32.ps1
index 1ed1a965..dca800a3 100644
--- a/src/scripts/win32.ps1
+++ b/src/scripts/win32.ps1
@@ -564,7 +564,9 @@ if($version -lt "5.5") {
 }
 
 # Remove patch once root certificates are updated on image.
-$cert_source = 'Curl'
+if($env:ImageOS -eq 'win16') {
+  $cert_source = 'Curl'
+}
 
 Enable-PhpExtension -Extension $enable_extensions -Path $php_dir
 Update-PhpCAInfo -Path $php_dir -Source $cert_source