diff --git a/spheroid.cpp b/spheroid.cpp
index 60b2d94..bd2c9b2 100644
--- a/spheroid.cpp
+++ b/spheroid.cpp
@@ -13,7 +13,7 @@ Spheroid::Spheroid(const Point& _center, double _min_p, double _p, double _q) :
 }
 
 void Spheroid::_compute_volume() {
-    V = (4/3) * PI * p * q * q;
+    V = (4./3.) * PI * p * q * q;
 }
 
 
@@ -32,7 +32,7 @@ void Spheroid::update_center_pos(Point& _center) {
 }
 
 void Spheroid::check_horizontal_plan_collision(double height) {
-    if (((center.y - p) <= height) || (p <= init_p)) {
+    if (((center.y - p) <= height) || (p < init_p)) {
         p = fmin(init_p, center.y-height);
         update_radius();
         std::cout << "p:" << p << "q:" << q << '\n';