1 files changed, 2 insertions, 2 deletions
diff --git a/app/assets/javascripts/components/reducers/modal.jsx b/app/assets/javascripts/components/reducers/modal.jsx
index 07da65771..37ffbc62b 100644
--- a/app/assets/javascripts/components/reducers/modal.jsx
+++ b/app/assets/javascripts/components/reducers/modal.jsx
@@ -23,9 +23,9 @@ export default function modal(state = initialState, action) {
   case MODAL_CLOSE:
     return state.set('open', false);
   case MODAL_INDEX_DECREASE:
-    return state.update('index', index => Math.max(index - 1, 0));
+    return state.update('index', index => (index - 1) % state.get('media').size);
   case MODAL_INDEX_INCREASE:
-    return state.update('index', index => Math.min(index + 1, state.get('media').size - 1));
+    return state.update('index', index => (index + 1) % state.get('media').size);
   default:
     return state;
   }