diff --git a/Source/Charts/Data/Implementations/Standard/ChartDataSet.swift b/Source/Charts/Data/Implementations/Standard/ChartDataSet.swift
index eabbf37e9f..15183d827b 100644
--- a/Source/Charts/Data/Implementations/Standard/ChartDataSet.swift
+++ b/Source/Charts/Data/Implementations/Standard/ChartDataSet.swift
@@ -122,9 +122,9 @@ open class ChartDataSet: ChartBaseDataSet
         let indexFrom = entryIndex(x: fromX, closestToY: Double.nan, rounding: .down)
         let indexTo = entryIndex(x: toX, closestToY: Double.nan, rounding: .up)
         
-        if indexTo <= indexFrom { return }
+        if indexTo < indexFrom { return }
         
-        for i in indexFrom..<indexTo
+        for i in indexFrom...indexTo
         {
             // only recalculate y
             calcMinMaxY(entry: _values[i])