diff --git a/src/ext/Firewall/test/WixToolsetTest.Firewall/TestData/UsingFirewall/PackageComponents.wxs b/src/ext/Firewall/test/WixToolsetTest.Firewall/TestData/UsingFirewall/PackageComponents.wxs
index b9ba0aa42..08802a866 100644
--- a/src/ext/Firewall/test/WixToolsetTest.Firewall/TestData/UsingFirewall/PackageComponents.wxs
+++ b/src/ext/Firewall/test/WixToolsetTest.Firewall/TestData/UsingFirewall/PackageComponents.wxs
@@ -12,9 +12,9 @@
                 </File>
 
                 <fw:FirewallException Description="A port-based firewall exception" Name="ExamplePort" Port="42" Outbound="yes" Scope="localSubnet" OnUpdate="enableOnly" />
-                <fw:FirewallException Description="DNS scope firewall exception" Name="ExampleDNSScope" Port="356" Protocol="udp" Scope="DNS" />
-                <fw:FirewallException Description="DHCP scope firewall exception" Name="ExampleDHCPScope" Program="test.exe" Protocol="211" Scope="DHCP" Profile="public" />
-                <fw:FirewallException Description="WINS scope firewall exception" Name="ExampleWINSScope" Port="6573" Scope="WINS" Profile="domain"/>
+                <fw:FirewallException Description="DNS scope firewall exception" Name="ExampleDNSScope" Port="356" Protocol="udp" Scope="dns" />
+                <fw:FirewallException Description="DHCP scope firewall exception" Name="ExampleDHCPScope" Program="test.exe" Protocol="211" Scope="dhcp" Profile="public" />
+                <fw:FirewallException Description="WINS scope firewall exception" Name="ExampleWINSScope" Port="6573" Scope="wins" Profile="domain"/>
                 <fw:FirewallException Description="defaultGateway scope firewall exception" Name="ExampleDefaultGatewayScope" Port="4432" Scope="defaultGateway" Profile="private" />
 
                 <fw:FirewallException Description="Defer to user edge traversal" Name="defertouser" Program="fw.exe" EdgeTraversal="deferToUser" />
diff --git a/src/ext/Firewall/wixext/FirewallCompiler.cs b/src/ext/Firewall/wixext/FirewallCompiler.cs
index 7db1dcc4e..013d15bc8 100644
--- a/src/ext/Firewall/wixext/FirewallCompiler.cs
+++ b/src/ext/Firewall/wixext/FirewallCompiler.cs
@@ -227,12 +227,15 @@ private void ParseFirewallExceptionElement(Intermediate intermediate, Intermedia
                                     remoteAddresses = "LocalSubnet";
                                     break;
                                 case "DNS":
+                                case "dns":
                                     remoteAddresses = "dns";
                                     break;
                                 case "DHCP":
+                                case "dhcp":
                                     remoteAddresses = "dhcp";
                                     break;
                                 case "WINS":
+                                case "wins":
                                     remoteAddresses = "wins";
                                     break;
                                 case "defaultGateway":
@@ -242,7 +245,7 @@ private void ParseFirewallExceptionElement(Intermediate intermediate, Intermedia
                                     remoteAddresses = scope;
                                     if (!this.ParseHelper.ContainsProperty(scope))
                                     {
-                                        this.Messaging.Write(ErrorMessages.IllegalAttributeValue(sourceLineNumbers, element.Name.LocalName, "Scope", scope, "any", "localSubnet", "DNS", "DHCP", "WINS", "defaultGateway"));
+                                        this.Messaging.Write(ErrorMessages.IllegalAttributeValue(sourceLineNumbers, element.Name.LocalName, "Scope", scope, "any", "localSubnet", "dns", "dhcp", "wins", "defaultGateway"));
                                     }
                                     break;
                             }
@@ -384,12 +387,15 @@ private void ParseFirewallExceptionElement(Intermediate intermediate, Intermedia
                                     localAddresses = "LocalSubnet";
                                     break;
                                 case "DNS":
+                                case "dns":
                                     localAddresses = "dns";
                                     break;
                                 case "DHCP":
+                                case "dhcp":
                                     localAddresses = "dhcp";
                                     break;
                                 case "WINS":
+                                case "wins":
                                     localAddresses = "wins";
                                     break;
                                 case "defaultGateway":
@@ -399,7 +405,7 @@ private void ParseFirewallExceptionElement(Intermediate intermediate, Intermedia
                                 default:
                                     if (!this.ParseHelper.ContainsProperty(localScope))
                                     {
-                                        this.Messaging.Write(ErrorMessages.IllegalAttributeValue(sourceLineNumbers, element.Name.LocalName, "LocalScope", localScope, "any", "localSubnet", "DNS", "DHCP", "WINS", "defaultGateway"));
+                                        this.Messaging.Write(ErrorMessages.IllegalAttributeValue(sourceLineNumbers, element.Name.LocalName, "LocalScope", localScope, "any", "localSubnet", "dns", "dhcp", "wins", "defaultGateway"));
                                     }
                                     else
                                     {
diff --git a/src/test/msi/TestData/FirewallExtensionTests/ScopeRules/product.wxs b/src/test/msi/TestData/FirewallExtensionTests/ScopeRules/product.wxs
index 776c86750..25d29f9fc 100644
--- a/src/test/msi/TestData/FirewallExtensionTests/ScopeRules/product.wxs
+++ b/src/test/msi/TestData/FirewallExtensionTests/ScopeRules/product.wxs
@@ -18,13 +18,13 @@
                 Name="WiXToolset401 Test - 0013" Scope="localSubnet" Port="1300" />
             <fw:FirewallException Id="FirewallException14"
                 Description="WiX Toolset firewall exception rule integration test - scope DNS"
-                Name="WiXToolset401 Test - 0014" Scope="DNS" Port="1400" />
+                Name="WiXToolset401 Test - 0014" Scope="dns" Port="1400" />
             <fw:FirewallException Id="FirewallException15"
                 Description="WiX Toolset firewall exception rule integration test - scope DHCP"
-                Name="WiXToolset401 Test - 0015" Scope="DHCP" Port="1500" />
+                Name="WiXToolset401 Test - 0015" Scope="dhcp" Port="1500" />
             <fw:FirewallException Id="FirewallException16"
                 Description="WiX Toolset firewall exception rule integration test - scope WINS"
-                Name="WiXToolset401 Test - 0016" Scope="WINS" Port="1600"  />
+                Name="WiXToolset401 Test - 0016" Scope="wins" Port="1600"  />
             <fw:FirewallException Id="FirewallException17"
                 Description="WiX Toolset firewall exception rule integration test - scope default gateway"
                 Name="WiXToolset401 Test - 0017" Scope="defaultGateway" Port="1700"  />