diff --git a/addons/mrp/static/src/scss/mrp_bom_report.scss b/addons/mrp/static/src/scss/mrp_bom_report.scss
index 6c28f55ce4b..ca2e10857fe 100644
--- a/addons/mrp/static/src/scss/mrp_bom_report.scss
+++ b/addons/mrp/static/src/scss/mrp_bom_report.scss
@@ -31,6 +31,14 @@
             }
         }
     }
+
+    @include media-breakpoint-down(sm) {
+        .o_mrp_bom_report_line {
+            & .fa-caret-down, & .fa-caret-right {
+                font-size: 2em;
+            }
+        }
+    }
 }
 
 .o_mrp_bom_report_buttons {