1 files changed, 6 insertions, 6 deletions
diff --git a/src/helpers/Vector2D.hpp b/src/helpers/Vector2D.hpp
index 5fe4ccd3..7288a088 100644
--- a/src/helpers/Vector2D.hpp
+++ b/src/helpers/Vector2D.hpp
@@ -14,24 +14,24 @@ class Vector2D {
     // returns the scale
     double normalize();
 
-    Vector2D operator+(const Vector2D a) {
+    Vector2D operator+(const Vector2D a) const {
         return Vector2D(this->x + a.x, this->y + a.y);
     }
-    Vector2D operator-(const Vector2D a) {
+    Vector2D operator-(const Vector2D a) const {
         return Vector2D(this->x - a.x, this->y - a.y);
     }
-    Vector2D operator*(const float a) {
+    Vector2D operator*(const float a) const {
         return Vector2D(this->x * a, this->y * a);
     }
-    Vector2D operator/(const float a) {
+    Vector2D operator/(const float a) const {
         return Vector2D(this->x / a, this->y / a);
     }
 
-    bool operator==(const Vector2D& a) {
+    bool operator==(const Vector2D& a) const {
         return a.x == x && a.y == y;
     }
 
-    bool operator!=(const Vector2D& a) {
+    bool operator!=(const Vector2D& a) const {
         return a.x != x || a.y != y;
     }