diff --git a/guacamole/src/main/java/org/glyptodon/guacamole/net/basic/ProtocolParameter.java b/guacamole/src/main/java/org/glyptodon/guacamole/net/basic/ProtocolParameter.java
index c3b6e3ee2..48307387a 100644
--- a/guacamole/src/main/java/org/glyptodon/guacamole/net/basic/ProtocolParameter.java
+++ b/guacamole/src/main/java/org/glyptodon/guacamole/net/basic/ProtocolParameter.java
@@ -43,7 +43,19 @@ public class ProtocolParameter {
         TEXT,
 
         /**
-         * A password parameter, whose value is sensitive and must be hidden.
+         * A username parameter. This parameter type generally behaves
+         * identically to arbitrary text parameters, but has semantic
+         * differences. If credential pass-through is in use, the value for this
+         * parameter may be automatically provided using the credentials
+         * originally used by the user to authenticate.
+         */
+        USERNAME,
+
+        /**
+         * A password parameter, whose value is sensitive and must be hidden. If
+         * credential pass-through is in use, the value for this parameter may
+         * be automatically provided using the credentials originally used by
+         * the user to authenticate.
          */
         PASSWORD,
 
diff --git a/guacamole/src/main/java/org/glyptodon/guacamole/net/basic/crud/protocols/List.java b/guacamole/src/main/java/org/glyptodon/guacamole/net/basic/crud/protocols/List.java
index f8eda88e9..7efcf6b06 100644
--- a/guacamole/src/main/java/org/glyptodon/guacamole/net/basic/crud/protocols/List.java
+++ b/guacamole/src/main/java/org/glyptodon/guacamole/net/basic/crud/protocols/List.java
@@ -149,6 +149,11 @@ public class List extends RestrictedHttpServlet {
                     xml.writeAttribute("type", "text");
                     break;
 
+                // Username parameter
+                case USERNAME:
+                    xml.writeAttribute("type", "username");
+                    break;
+
                 // Password parameter
                 case PASSWORD:
                     xml.writeAttribute("type", "password");
diff --git a/guacamole/src/main/java/org/glyptodon/guacamole/net/basic/xml/protocol/ParamTagHandler.java b/guacamole/src/main/java/org/glyptodon/guacamole/net/basic/xml/protocol/ParamTagHandler.java
index c4d4170c9..26336432e 100644
--- a/guacamole/src/main/java/org/glyptodon/guacamole/net/basic/xml/protocol/ParamTagHandler.java
+++ b/guacamole/src/main/java/org/glyptodon/guacamole/net/basic/xml/protocol/ParamTagHandler.java
@@ -57,6 +57,10 @@ public class ParamTagHandler implements TagHandler {
         else if ("numeric".equals(type))
             protocolParameter.setType(ProtocolParameter.Type.NUMERIC);
 
+        // Username field
+        else if ("username".equals(type))
+            protocolParameter.setType(ProtocolParameter.Type.USERNAME);
+
         // Password field
         else if ("password".equals(type))
             protocolParameter.setType(ProtocolParameter.Type.PASSWORD);
diff --git a/guacamole/src/main/resources/net/sourceforge/guacamole/net/protocols/rdp.xml b/guacamole/src/main/resources/net/sourceforge/guacamole/net/protocols/rdp.xml
index ebe82ae8f..7bd39404f 100644
--- a/guacamole/src/main/resources/net/sourceforge/guacamole/net/protocols/rdp.xml
+++ b/guacamole/src/main/resources/net/sourceforge/guacamole/net/protocols/rdp.xml
@@ -3,7 +3,7 @@
     <param name="hostname"        type="text"     title="Hostname"/>
     <param name="port"            type="numeric"  title="Port"/>
 
-    <param name="username"        type="text"     title="Username"/>
+    <param name="username"        type="username" title="Username"/>
     <param name="password"        type="password" title="Password"/>
     <param name="domain"          type="text"     title="Domain"/>
     <param name="initial-program" type="text"     title="Initial program"/>
diff --git a/guacamole/src/main/resources/net/sourceforge/guacamole/net/protocols/ssh.xml b/guacamole/src/main/resources/net/sourceforge/guacamole/net/protocols/ssh.xml
index a04327b1e..8239e7160 100644
--- a/guacamole/src/main/resources/net/sourceforge/guacamole/net/protocols/ssh.xml
+++ b/guacamole/src/main/resources/net/sourceforge/guacamole/net/protocols/ssh.xml
@@ -3,7 +3,7 @@
     <param name="hostname" title="Hostname" type="text"/>
     <param name="port"     title="Port"     type="numeric"/>
 
-    <param name="username" title="Username" type="text"/>
+    <param name="username" title="Username" type="username"/>
     <param name="password" title="Password" type="password"/>
 
     <param name="font-name" title="Font name" type="text"/>
diff --git a/guacamole/src/main/resources/net/sourceforge/guacamole/net/protocols/telnet.xml b/guacamole/src/main/resources/net/sourceforge/guacamole/net/protocols/telnet.xml
index 09e1f2443..fe797436b 100644
--- a/guacamole/src/main/resources/net/sourceforge/guacamole/net/protocols/telnet.xml
+++ b/guacamole/src/main/resources/net/sourceforge/guacamole/net/protocols/telnet.xml
@@ -3,7 +3,7 @@
     <param name="hostname" title="Hostname" type="text"/>
     <param name="port"     title="Port"     type="numeric"/>
 
-    <param name="username" title="Username" type="text"/>
+    <param name="username" title="Username" type="username"/>
     <param name="password" title="Password" type="password"/>
 
     <param name="password-regex"
diff --git a/guacamole/src/main/webapp/scripts/admin-ui.js b/guacamole/src/main/webapp/scripts/admin-ui.js
index 0bf2296ac..35b45b677 100644
--- a/guacamole/src/main/webapp/scripts/admin-ui.js
+++ b/guacamole/src/main/webapp/scripts/admin-ui.js
@@ -885,8 +885,9 @@ GuacAdmin.ConnectionEditor = function(connection, parameters) {
             var field;
             switch (parameter.type) {
 
-                // Text field
+                // Text or username field
                 case GuacamoleService.Protocol.Parameter.TEXT:
+                case GuacamoleService.Protocol.Parameter.USERNAME:
                     field = new GuacAdmin.Field.TEXT();
                     break;
 
diff --git a/guacamole/src/main/webapp/scripts/service.js b/guacamole/src/main/webapp/scripts/service.js
index fef93bd99..97527266e 100644
--- a/guacamole/src/main/webapp/scripts/service.js
+++ b/guacamole/src/main/webapp/scripts/service.js
@@ -1284,6 +1284,11 @@ GuacamoleService.Protocol.Parameter.ENUM = 4;
  */
 GuacamoleService.Protocol.Parameter.MULTILINE = 5;
 
+/**
+ * A username field.
+ */
+GuacamoleService.Protocol.Parameter.USERNAME = 6;
+
 /**
  * Collection of service functions which deal with protocols. Each function
  * makes an explicit HTTP query to the server, and parses the response.
@@ -1355,6 +1360,11 @@ GuacamoleService.Protocols = {
                         parameter.type = GuacamoleService.Protocol.Parameter.TEXT;
                         break;
 
+                    // Username parameter
+                    case "username":
+                        parameter.type = GuacamoleService.Protocol.Parameter.USERNAME;
+                        break;
+
                     // Password parameter
                     case "password":
                         parameter.type = GuacamoleService.Protocol.Parameter.PASSWORD;