diff --git a/libs/geom/include/psemek/geom/math.hpp b/libs/geom/include/psemek/geom/math.hpp
index 8eea2b31..6b5a69f6 100644
--- a/libs/geom/include/psemek/geom/math.hpp
+++ b/libs/geom/include/psemek/geom/math.hpp
@@ -40,7 +40,7 @@ namespace psemek::geom
 		auto const D = b * b - 4 * a * c;
 		if (D < 0) return std::nullopt;
 
-		auto t = - (b + (b > 0 ? 1 : -1) * std::sqrt(D));
+		auto t = - (b + (b > 0 ? 1 : -1) * std::sqrt(D)) / 2;
 		auto x1 = t / a;
 		auto x2 = c / t;