diff --git a/apps/regression/store.cpp b/apps/regression/store.cpp
index bbd283767..6565e8bd9 100644
--- a/apps/regression/store.cpp
+++ b/apps/regression/store.cpp
@@ -61,7 +61,7 @@ void Store::setSeriesRegressionType(int series, Model::Type type) {
   }
 }
 
-int Store::closestVerticalRegression(int direction, float x, float y, int currentRegressionSeries, Poincare::Context * globalContext) {
+int Store::closestVerticalRegression(int direction, double x, double y, int currentRegressionSeries, Poincare::Context * globalContext) {
   int regressionSeries = -1;
   float closestDistance = INFINITY;
   /* The conditions to test on all the regressions are in this order:
@@ -85,9 +85,9 @@ int Store::closestVerticalRegression(int direction, float x, float y, int curren
 
 /* Dots */
 
-int Store::closestVerticalDot(int direction, float x, float y, int currentSeries, int currentDot, int * nextSeries, Poincare::Context * globalContext) {
-  float nextX = INFINITY;
-  float nextY = INFINITY;
+int Store::closestVerticalDot(int direction, double x, double y, int currentSeries, int currentDot, int * nextSeries, Poincare::Context * globalContext) {
+  double nextX = INFINITY;
+  double nextY = INFINITY;
   int selectedDot = -1;
   /* The conditions to test on all dots are in this order:
    * - if the currentDot is valid, the next series should not be the current series
diff --git a/apps/regression/store.h b/apps/regression/store.h
index 1d360dbef..a3c7bc447 100644
--- a/apps/regression/store.h
+++ b/apps/regression/store.h
@@ -30,11 +30,11 @@ public:
   }
   /* Return the series index of the closest regression at abscissa x, above
    * ordinate y if direction > 0, below otherwise */
-  int closestVerticalRegression(int direction, float x, float y, int currentRegressionSeries, Poincare::Context * globalContext);
+  int closestVerticalRegression(int direction, double x, double y, int currentRegressionSeries, Poincare::Context * globalContext);
   // Dots
   /* Return the closest dot to abscissa x above the regression curve if
    * direction > 0, below otherwise */
-  int closestVerticalDot(int direction, float x, float y, int currentSeries, int currentDot, int * nextSeries, Poincare::Context * globalContext);
+  int closestVerticalDot(int direction, double x, double y, int currentSeries, int currentDot, int * nextSeries, Poincare::Context * globalContext);
   /* Return the closest dot to given dot, on the right if direction > 0,
    * on the left otherwise */
   int nextDot(int series, int direction, int dot);