diff --git a/samples/Chart/33_Chart_create_multiple_charts.php b/samples/Chart/33_Chart_create_multiple_charts.php
index d0de5db4..c25328a8 100644
--- a/samples/Chart/33_Chart_create_multiple_charts.php
+++ b/samples/Chart/33_Chart_create_multiple_charts.php
@@ -83,7 +83,7 @@ $chart1 = new Chart(
     $legend1, // legend
     $plotArea1, // plotArea
     true, // plotVisibleOnly
-    0, // displayBlanksAs
+    DataSeries::EMPTY_AS_GAP, // displayBlanksAs
     null, // xAxisLabel
     $yAxisLabel1 // yAxisLabel
 );
diff --git a/samples/Chart/33_Chart_create_pie.php b/samples/Chart/33_Chart_create_pie.php
index 54d5916b..0df41143 100644
--- a/samples/Chart/33_Chart_create_pie.php
+++ b/samples/Chart/33_Chart_create_pie.php
@@ -154,7 +154,7 @@ $chart2 = new Chart(
     null, // legend
     $plotArea2, // plotArea
     true, // plotVisibleOnly
-    0, // displayBlanksAs
+    DataSeries::EMPTY_AS_GAP, // displayBlanksAs
     null, // xAxisLabel
     null   // yAxisLabel - Like Pie charts, Donut charts don't have a Y-Axis
 );
diff --git a/samples/Chart/33_Chart_create_pie_custom_colors.php b/samples/Chart/33_Chart_create_pie_custom_colors.php
index 0e9ce4b7..137e6e75 100644
--- a/samples/Chart/33_Chart_create_pie_custom_colors.php
+++ b/samples/Chart/33_Chart_create_pie_custom_colors.php
@@ -90,7 +90,7 @@ $chart1 = new Chart(
     $legend1, // legend
     $plotArea1, // plotArea
     true, // plotVisibleOnly
-    0, // displayBlanksAs
+    DataSeries::EMPTY_AS_GAP, // displayBlanksAs
     null, // xAxisLabel
     null   // yAxisLabel - Pie charts don't have a Y-Axis
 );
diff --git a/samples/templates/chartSpreadsheet.php b/samples/templates/chartSpreadsheet.php
index 84c8c956..44d7b543 100644
--- a/samples/templates/chartSpreadsheet.php
+++ b/samples/templates/chartSpreadsheet.php
@@ -83,7 +83,7 @@ $chart = new Chart(
     $legend, // legend
     $plotArea, // plotArea
     true, // plotVisibleOnly
-    0, // displayBlanksAs
+    DataSeries::EMPTY_AS_GAP, // displayBlanksAs
     null, // xAxisLabel
     $yAxisLabel  // yAxisLabel
 );
diff --git a/src/PhpSpreadsheet/Chart/Chart.php b/src/PhpSpreadsheet/Chart/Chart.php
index bc42c854..7064160e 100644
--- a/src/PhpSpreadsheet/Chart/Chart.php
+++ b/src/PhpSpreadsheet/Chart/Chart.php
@@ -68,7 +68,7 @@ class Chart
      *
      * @var string
      */
-    private $displayBlanksAs = '0';
+    private $displayBlanksAs = DataSeries::EMPTY_AS_GAP;
 
     /**
      * Chart Asix Y as.
@@ -148,7 +148,7 @@ class Chart
      * @param null|Legend $legend
      * @param null|PlotArea $plotArea
      * @param mixed $plotVisibleOnly
-     * @param mixed $displayBlanksAs
+     * @param string $displayBlanksAs
      * @param null|Title $xAxisLabel
      * @param null|Title $yAxisLabel
      * @param null|Axis $xAxis