diff --git a/src/module/timeLabel.js b/src/module/timeLabel.js
index 9d3212c..e6f5cba 100644
--- a/src/module/timeLabel.js
+++ b/src/module/timeLabel.js
@@ -76,11 +76,7 @@ const getTimeUnitAndValueToUse = (secondToDecide) => {
  * @returns {string} The formatted tick label (e.g. "2.5h").
  */
 export function getYTicksByIndex(stepSize, index, unitToUse) {
-  const rawStepsizeMultIndex = (stepSize * index).toString();
-  const shortenStepsizeMultIndex = rawStepsizeMultIndex.substring(
-    0,
-    rawStepsizeMultIndex.indexOf(".") + 1 + TOFIXED_DECIMAL,
-  );
+  const shortenStepsizeMultIndex = (stepSize * index).toFixed(TOFIXED_DECIMAL);
   return `${shortenStepsizeMultIndex}${unitToUse}`;
 }
 
diff --git a/tests/unit/module/timeLabel.test.js b/tests/unit/module/timeLabel.test.js
index 2eff072..6d4ad25 100644
--- a/tests/unit/module/timeLabel.test.js
+++ b/tests/unit/module/timeLabel.test.js
@@ -123,7 +123,7 @@ describe("getStepSizeOfYTicks", () => {
 
 describe("getYTicksByIndex", () => {
   it("formats tick label with unit", () => {
-    expect(getYTicksByIndex(2, 3, "h")).toBe("6h");
+    expect(getYTicksByIndex(2, 3, "h")).toBe("6.0h");
   });
 
   it("truncates to 1 decimal place", () => {