diff --git a/src/Invite.js b/src/Invite.js
index 3b52d6a1f4..2c908628b6 100644
--- a/src/Invite.js
+++ b/src/Invite.js
@@ -43,3 +43,20 @@ export function inviteToRoom(roomId, addr) {
         throw new Error('Unsupported address');
     }
 }
+
+export function isValidAddress(addr) {
+    // Check if the addr is a valid type
+    var addrType = this.getAddressType(addr);
+    if (addrType === "mx") {
+        let user = MatrixClientPeg.get().getUser(addr);
+        if (user) {
+            return true;
+        } else {
+            return false;
+        }
+    } else if (addrType === "email") {
+        return true;
+    } else {
+        return false;
+    }
+}
diff --git a/src/components/views/dialogs/ChatInviteDialog.js b/src/components/views/dialogs/ChatInviteDialog.js
index bf4acf59d3..3cfe7303be 100644
--- a/src/components/views/dialogs/ChatInviteDialog.js
+++ b/src/components/views/dialogs/ChatInviteDialog.js
@@ -122,7 +122,7 @@ module.exports = React.createClass({
         } else if (e.keyCode === 32 || e.keyCode === 188) { // space or comma
             e.stopPropagation();
             e.preventDefault();
-            if (this._isValidAddress(this.refs.textinput.value)) {
+            if (Invite.isValidAddress(this.refs.textinput.value)) {
                 var inviteList = this.state.inviteList.slice();
                 inviteList.push(this.refs.textinput.value);
                 this.setState({
@@ -271,23 +271,6 @@ module.exports = React.createClass({
         return false;
     },
 
-    _isValidAddress: function(addr) {
-        // Check if the addr is a valid type
-        var addrType = Invite.getAddressType(addr);
-        if (addrType === "mx") {
-            let user = MatrixClientPeg.get().getUser(addr);
-            if (user) {
-                return true;
-            } else {
-                return false;
-            }
-        } else if (addrType === "email") {
-            return true;
-        } else {
-            return false;
-        }
-    },
-
     render: function() {
         var TintableSvg = sdk.getComponent("elements.TintableSvg");
         var AddressSelector = sdk.getComponent("elements.AddressSelector");