diff --git a/tools/PostGeneration/NewCommandMetadata.ps1 b/tools/PostGeneration/NewCommandMetadata.ps1
index 429cdf78d2..fff1daa013 100644
--- a/tools/PostGeneration/NewCommandMetadata.ps1
+++ b/tools/PostGeneration/NewCommandMetadata.ps1
@@ -78,7 +78,7 @@ $ApiVersion | ForEach-Object {
             if (-not($Null -eq $CommandAliasValue)) {
                 $CommandAliasValue = $CommandAliasValue.Replace("[global::System.Management.Automation.Alias(`"", "").Replace("`")", "").Replace("]", "")
             }
-            if(-not($CommandAliasValue -contains "-Mg")) {
+            if(-not($CommandAliasValue.Contains("-Mg"))) {
                 $CommandAliasValue = $null
             }
             $MappingValue = @{