diff --git a/lib/puppet/provider/dsc_base_provider/dsc_base_provider.rb b/lib/puppet/provider/dsc_base_provider/dsc_base_provider.rb
index cd977738..be189e0b 100644
--- a/lib/puppet/provider/dsc_base_provider/dsc_base_provider.rb
+++ b/lib/puppet/provider/dsc_base_provider/dsc_base_provider.rb
@@ -773,7 +773,7 @@ def munge_psmodulepath(resource)
     <<~MUNGE_PSMODULEPATH.strip
       $UnmungedPSModulePath = [System.Environment]::GetEnvironmentVariable('PSModulePath','machine')
       $MungedPSModulePath = $env:PSModulePath + ';#{vendor_path}'
-      [System.Environment]::SetEnvironmentVariable('PSModulePath', $MungedPSModulePath, [System.EnvironmentVariableTarget]::Machine)
+      Set-ItemProperty -Path 'HKLM:\\SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment' -Name 'PSModulePath' -Value $MungedPSModulePath
       $env:PSModulePath = [System.Environment]::GetEnvironmentVariable('PSModulePath','machine')
     MUNGE_PSMODULEPATH
   end
diff --git a/lib/puppet/provider/dsc_base_provider/invoke_dsc_resource_postscript.ps1 b/lib/puppet/provider/dsc_base_provider/invoke_dsc_resource_postscript.ps1
index ffbbf029..87cc7365 100644
--- a/lib/puppet/provider/dsc_base_provider/invoke_dsc_resource_postscript.ps1
+++ b/lib/puppet/provider/dsc_base_provider/invoke_dsc_resource_postscript.ps1
@@ -6,7 +6,7 @@ Try {
 } Finally {
   If (![string]::IsNullOrEmpty($UnmungedPSModulePath)) {
     # Reset the PSModulePath
-    [System.Environment]::SetEnvironmentVariable('PSModulePath', $UnmungedPSModulePath, [System.EnvironmentVariableTarget]::Machine)
+    Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\Environment' -Name 'PSModulePath' -Value $UnmungedPSModulePath
     $env:PSModulePath = [System.Environment]::GetEnvironmentVariable('PSModulePath', 'machine')
   }
 }
diff --git a/spec/unit/puppet/provider/dsc_base_provider/dsc_base_provider_spec.rb b/spec/unit/puppet/provider/dsc_base_provider/dsc_base_provider_spec.rb
index fc472c43..3edc007f 100644
--- a/spec/unit/puppet/provider/dsc_base_provider/dsc_base_provider_spec.rb
+++ b/spec/unit/puppet/provider/dsc_base_provider/dsc_base_provider_spec.rb
@@ -1529,7 +1529,8 @@
       end
 
       it 'updates the system PSModulePath to $MungedPSModulePath' do
-        expect(result).to match(/SetEnvironmentVariable\('PSModulePath', \$MungedPSModulePath/)
+        -Name 'PSModulePath' -Value $MungedPSModulePath
+        expect(result).to match(/-Name 'PSModulePath' -Value \$MungedPSModulePath/)
       end
 
       it 'sets the process level PSModulePath to the modified system PSModulePath' do