diff --git a/SDL2pp/Rect.cc b/SDL2pp/Rect.cc
index adbc503..af16f76 100644
--- a/SDL2pp/Rect.cc
+++ b/SDL2pp/Rect.cc
@@ -159,6 +159,18 @@ Rect Rect::GetUnion(const Rect& rect) const {
 		);
 }
 
+Rect& Rect::Union(const Rect& rect) {
+	int nx = std::min(x, rect.x);
+	int ny = std::min(y, rect.y);
+	int nx2 = std::max(GetX2(), rect.GetX2());
+	int ny2 = std::max(GetY2(), rect.GetY2());
+	x = nx;
+	y = ny;
+	SetX2(nx2);
+	SetY2(ny2);
+	return *this;
+}
+
 Optional<Rect> Rect::GetIntersection(const Rect& rect) const {
 	if (!Intersects(rect))
 		return NullOpt;
diff --git a/SDL2pp/Rect.hh b/SDL2pp/Rect.hh
index 6cd7b71..e45eb0d 100644
--- a/SDL2pp/Rect.hh
+++ b/SDL2pp/Rect.hh
@@ -336,6 +336,16 @@ public:
 	////////////////////////////////////////////////////////////
 	Rect GetUnion(const Rect& rect) const;
 
+	////////////////////////////////////////////////////////////
+	/// \brief Union rect with another rect
+	///
+	/// \param[in] rect Rect to union with
+	///
+	/// \returns Reference to self
+	///
+	////////////////////////////////////////////////////////////
+	Rect& Union(const Rect& rect);
+
 	////////////////////////////////////////////////////////////
 	/// \brief Calculate intersection with another rect
 	///
diff --git a/tests/test_pointrect.cc b/tests/test_pointrect.cc
index 00884a1..780baf0 100644
--- a/tests/test_pointrect.cc
+++ b/tests/test_pointrect.cc
@@ -233,6 +233,11 @@ BEGIN_TEST()
 		EXPECT_TRUE(Rect(30, 20, 1, 1).GetUnion(Rect(10, 40, 1, 1)) == Rect::FromCorners(10, 20, 30, 40));
 		EXPECT_TRUE(Rect(10, 40, 1, 1).GetUnion(Rect(30, 20, 1, 1)) == Rect::FromCorners(10, 20, 30, 40));
 		EXPECT_TRUE(Rect(30, 40, 1, 1).GetUnion(Rect(10, 20, 1, 1)) == Rect::FromCorners(10, 20, 30, 40));
+
+		EXPECT_TRUE(Rect(10, 20, 1, 1).Union(Rect(30, 40, 1, 1)) == Rect::FromCorners(10, 20, 30, 40));
+		EXPECT_TRUE(Rect(30, 20, 1, 1).Union(Rect(10, 40, 1, 1)) == Rect::FromCorners(10, 20, 30, 40));
+		EXPECT_TRUE(Rect(10, 40, 1, 1).Union(Rect(30, 20, 1, 1)) == Rect::FromCorners(10, 20, 30, 40));
+		EXPECT_TRUE(Rect(30, 40, 1, 1).Union(Rect(10, 20, 1, 1)) == Rect::FromCorners(10, 20, 30, 40));
 	}
 
 	{