diff --git a/app/assets/stylesheets/mobile/modal.scss b/app/assets/stylesheets/mobile/modal.scss
index 9715a193161..7114c9b2e1f 100644
--- a/app/assets/stylesheets/mobile/modal.scss
+++ b/app/assets/stylesheets/mobile/modal.scss
@@ -92,6 +92,10 @@
       width: 100%;
     }
   }
+
+  .category-combobox {
+    width: 100%;
+  }
 }
 
 .flag-modal {