diff --git a/src/HrPwPlot.cpp b/src/HrPwPlot.cpp
index ff0da92c8..fa71760ca 100644
--- a/src/HrPwPlot.cpp
+++ b/src/HrPwPlot.cpp
@@ -387,7 +387,7 @@ HrPwPlot::addWattStepCurve(QVector<double> &finalWatts, int nbpoints)
     smoothWattsStep[t] = t * 10;
 
     wattsStepCurve->setData(smoothWattsStep.data(), smoothTimeStep.data(), nbSteps+1);
-    delete array;
+    delete [] array;
 }
 
 void
@@ -431,7 +431,7 @@ HrPwPlot::addHrStepCurve(QVector<double> &finalHr, int nbpoints)
     smoothHrStep[t] = t * 2;
 
     hrStepCurve->setData(smoothTimeStep2.data(), smoothHrStep.data(), nbSteps+1);
-    delete array;
+    delete [] array;
 }
 
 void