diff --git a/python/port/mod/turtle/turtle.cpp b/python/port/mod/turtle/turtle.cpp
index f7cd49c5c..98d0c6330 100644
--- a/python/port/mod/turtle/turtle.cpp
+++ b/python/port/mod/turtle/turtle.cpp
@@ -175,6 +175,13 @@ void Turtle::viewDidDisappear() {
 
 // Private functions
 
+void Turtle::setHeadingPrivate(mp_float_t angle) {
+  // Put the angle in [0; 360[
+  mp_float_t angleLimit = 360;
+  m_heading = angle - ((angle >= 0 && angle < angleLimit) ? 0 : std::floor(angle/angleLimit) * angleLimit);
+  assert(m_heading >= 0 && m_heading < angleLimit);
+}
+
 KDPoint Turtle::position(mp_float_t x, mp_float_t y) const {
   return KDPoint(floor(x + k_xOffset), floor(k_invertedYAxisCoefficient * y + k_yOffset));
 }
diff --git a/python/port/mod/turtle/turtle.h b/python/port/mod/turtle/turtle.h
index 987d73a90..2b9d83b9c 100644
--- a/python/port/mod/turtle/turtle.h
+++ b/python/port/mod/turtle/turtle.h
@@ -115,7 +115,7 @@ private:
     KDColor m_color;
   };
 
-  void setHeadingPrivate(mp_float_t angle) { m_heading = angle; }
+  void setHeadingPrivate(mp_float_t angle);
   KDPoint position(mp_float_t x, mp_float_t y) const;
   KDPoint position() const { return position(m_x, m_y); }