diff --git a/lib/src/flutter_range_slider.dart b/lib/src/flutter_range_slider.dart
index 872a0c5..fb87302 100644
--- a/lib/src/flutter_range_slider.dart
+++ b/lib/src/flutter_range_slider.dart
@@ -1277,6 +1277,20 @@ class _RenderRangeSlider extends RenderBox {
   _ActiveThumb _previousActiveThumb = _ActiveThumb.none;
 
   _validateActiveThumb(Offset position) {
+
+    void setUpperThumbAsActive(double divisionOffset) {
+      _activeThumb = _ActiveThumb.upperThumb;
+      _minDragValue = _discretize(_lowerValue + divisionOffset);
+      _maxDragValue = 1.0;
+    }
+
+    void setLowerThumbAsActive(double divisionOffset) {
+      _activeThumb = _ActiveThumb.lowerThumb;
+      _minDragValue = 0.0;
+      _maxDragValue = _discretize(_upperValue - divisionOffset);
+    }
+
+
     var _thumbLowerExpandedRect = Rect.fromCircle(
         center: _thumbLowerRect.centerLeft,
         radius: _thumbRadius * _touchRadiusExpansionRatio);
@@ -1288,14 +1302,16 @@ class _RenderRangeSlider extends RenderBox {
         : (_thumbRadius * 2.0) / _trackLength;
     double divisionOffset = _allowThumbOverlap ? 0.0 : calculatedDivisionOffset;
 
-    if (_thumbLowerExpandedRect.contains(position)) {
-      _activeThumb = _ActiveThumb.lowerThumb;
-      _minDragValue = 0.0;
-      _maxDragValue = _discretize(_upperValue - divisionOffset);
+    if (_thumbLowerExpandedRect.contains(position) && _thumbUpperExpandedRect.contains(position)) {
+      if (_upperValue < 0.5) {
+        setUpperThumbAsActive(divisionOffset);
+      } else {
+        setLowerThumbAsActive(divisionOffset);
+      }
+    } else if (_thumbLowerExpandedRect.contains(position)) {
+      setLowerThumbAsActive(divisionOffset);
     } else if (_thumbUpperExpandedRect.contains(position)) {
-      _activeThumb = _ActiveThumb.upperThumb;
-      _minDragValue = _discretize(_lowerValue + divisionOffset);
-      _maxDragValue = 1.0;
+      setUpperThumbAsActive(divisionOffset);
     } else {
       _activeThumb = _ActiveThumb.none;
     }