diff --git a/samples/manage/azure-sql-db-managed-instance/prepare-subnet/prepareSubnet.ps1 b/samples/manage/azure-sql-db-managed-instance/prepare-subnet/prepareSubnet.ps1
index b925c005..a26f5e66 100644
--- a/samples/manage/azure-sql-db-managed-instance/prepare-subnet/prepareSubnet.ps1
+++ b/samples/manage/azure-sql-db-managed-instance/prepare-subnet/prepareSubnet.ps1
@@ -67,7 +67,7 @@ function ConvertCidrToUint32Array
     param(
         $cidrRange
     )
-    $cidrRangeParts = $cidrRange.Split(@(".","/"))
+    $cidrRangeParts = $cidrRange.Split([char]".",[char]"/")
 
     If(
         ($cidrRangeParts[0] -eq 0) -and `