diff --git a/shell/applets/SparklineCanvas.qml b/shell/applets/SparklineCanvas.qml
index cffabb1..4322656 100644
--- a/shell/applets/SparklineCanvas.qml
+++ b/shell/applets/SparklineCanvas.qml
@@ -142,10 +142,12 @@ Canvas {
                 if (hasCF)
                     ctx.fillStyle = colorFunction(d[i]).toString();
                 const [bx, bw] = xOf(i);
+                const x0 = Math.floor(bx);
+                const x1 = Math.floor(bx + bw);
                 const dy = yOf(d[i]);
                 const barTop = Math.min(dy, zy);
                 const barH = Math.max(1, Math.abs(dy - zy));
-                ctx.fillRect(bx, barTop, Math.ceil(bw), barH);
+                ctx.fillRect(x0, barTop, Math.max(1, x1 - x0), barH);
             }
         }
     }