diff --git a/web/components/stepper.react.js b/web/components/stepper.react.js
--- a/web/components/stepper.react.js
+++ b/web/components/stepper.react.js
@@ -11,7 +11,7 @@
   +content: React.Node,
   +disabled?: boolean,
   +loading?: boolean,
-  +onClick: () => void,
+  +onClick: () => mixed,
 };
 
 type ButtonType = 'prev' | 'next';
diff --git a/web/modals/threads/create/compose-subchannel-modal.react.js b/web/modals/threads/create/compose-subchannel-modal.react.js
--- a/web/modals/threads/create/compose-subchannel-modal.react.js
+++ b/web/modals/threads/create/compose-subchannel-modal.react.js
@@ -214,9 +214,7 @@
           content: 'Create',
           loading: loadingState === 'loading',
           disabled: selectedUsers.size === 0,
-          onClick: () => {
-            dispatchCreateSubchannel();
-          },
+          onClick: dispatchCreateSubchannel,
         },
       },
     }),