diff --git a/src/gamepad/joystick_transformation.cpp b/src/gamepad/joystick_transformation.cpp
index 18ec32a..225c2d1 100644
--- a/src/gamepad/joystick_transformation.cpp
+++ b/src/gamepad/joystick_transformation.cpp
@@ -35,8 +35,8 @@ std::pair<float, float> Fisheye::get_value(std::pair<float, float> value) {
     float j = std::sqrt(m_radius * m_radius - 1.0 * 1.0);
     if (x_abs >= j && y_abs >= j) {
         float theta = std::atan2(y_abs, x_abs);
-        x_abs *= std::acos(abs(std::remainder(theta, 90)));
-        y_abs *= std::acos(abs(std::remainder(theta, 90)));
+        x_abs *= m_radius / std::cos(abs(std::remainder(theta, 90)));
+        y_abs *= m_radius / std::cos(abs(std::remainder(theta, 90)));
     }
     x = std::copysign(std::min(1.0f, x_abs), x);
     y = std::copysign(std::min(1.0f, y_abs), y);