diff --git a/test/powershell/Modules/Microsoft.PowerShell.Utility/Join-String.Tests.ps1 b/test/powershell/Modules/Microsoft.PowerShell.Utility/Join-String.Tests.ps1
index 20829d621d..4f4bdedf9e 100644
--- a/test/powershell/Modules/Microsoft.PowerShell.Utility/Join-String.Tests.ps1
+++ b/test/powershell/Modules/Microsoft.PowerShell.Utility/Join-String.Tests.ps1
@@ -25,13 +25,13 @@ Describe "Join-String" -Tags "CI" {
     }
 
     It "Should join property values with default separator" {
-        $expected = $testObject.Name -join $ofs
+        $expected = $testObject.Name -join $OFS
         $actual = $testObject | Join-String -Property Name
         $actual | Should -BeExactly $expected
     }
 
     It "Should join property values positionally with default separator" {
-        $expected = $testObject.Name -join $ofs
+        $expected = $testObject.Name -join $OFS
         $actual = $testObject | Join-String Name
         $actual | Should -BeExactly $expected
     }
@@ -69,7 +69,7 @@ Describe "Join-String" -Tags "CI" {
 
     It "Should join script block results with default separator" {
         $sb = {$_.Name + $_.Length}
-        $expected = ($testObject | ForEach-Object $sb) -join $ofs
+        $expected = ($testObject | ForEach-Object $sb) -join $OFS
         $actual = $testObject | Join-String -Property $sb
         $actual | Should -BeExactly $expected
     }
@@ -83,13 +83,13 @@ Describe "Join-String" -Tags "CI" {
 
     It "Should join script block results SingleQuoted" {
         $sb = {$_.Name + $_.Length}
-        $expected = ($testObject | ForEach-Object $sb).ForEach{"'$_'"} -join $ofs
+        $expected = ($testObject | ForEach-Object $sb).ForEach{"'$_'"} -join $OFS
         $actual = $testObject | Join-String -Property $sb -SingleQuote
         $actual | Should -BeExactly $expected
     }
     It "Should join script block results DoubleQuoted" {
         $sb = {$_.Name + $_.Length}
-        $expected = ($testObject | ForEach-Object $sb).ForEach{"""$_"""} -join $ofs
+        $expected = ($testObject | ForEach-Object $sb).ForEach{"""$_"""} -join $OFS
         $actual = $testObject | Join-String -Property $sb -DoubleQuote
         $actual | Should -BeExactly $expected
     }
@@ -102,7 +102,7 @@ Describe "Join-String" -Tags "CI" {
     }
 
     It "Should Handle OutputPrefix and OutputSuffix" {
-        $ofs = ','
+        $OFS = ','
         $expected = "A 1,2,3 B"
         $actual = 1..3 | Join-String -OutputPrefix "A " -OutputSuffix " B"
         $actual | Should -BeExactly $expected