diff --git a/libs/geom/include/psemek/geom/math.hpp b/libs/geom/include/psemek/geom/math.hpp
index 1ef70b72..0c2d4b8c 100644
--- a/libs/geom/include/psemek/geom/math.hpp
+++ b/libs/geom/include/psemek/geom/math.hpp
@@ -37,8 +37,8 @@ namespace psemek::geom
 		return static_cast<T>((x * pi) / 180);
 	}
 
-	template <typename T>
-	T lerp(T const & x0, T const & x1, T const & t)
+	template <typename X, typename T>
+	X lerp(X const & x0, X const & x1, T const & t)
 	{
 		return x0 * (T(1) - t) + x1 * t;
 	}