diff --git a/testsuite/gsk/curve-special-cases.c b/testsuite/gsk/curve-special-cases.c
index afd45c4258..88683a051d 100644
--- a/testsuite/gsk/curve-special-cases.c
+++ b/testsuite/gsk/curve-special-cases.c
@@ -88,7 +88,6 @@ test_curve_tangents (void)
   gsk_curve_get_end_tangent (&c, &t);
   g_assert_true (graphene_vec2_near (&t, graphene_vec2_x_axis (), 0.0001));
 
-
   graphene_point_init (&p[0], 0, 0);
   graphene_point_init (&p[1], 0, 100);
   gsk_curve_init (&c, gsk_pathop_encode (GSK_PATH_LINE, p));
@@ -121,6 +120,36 @@ test_curve_tangents (void)
   g_assert_true (graphene_vec2_near (&t, graphene_vec2_y_axis (), 0.0001));
 }
 
+static void
+test_curve_degenerate_tangents (void)
+{
+  GskCurve c;
+  graphene_point_t p[4];
+  graphene_vec2_t t;
+
+  graphene_point_init (&p[0], 0, 0);
+  graphene_point_init (&p[1], 0, 0);
+  graphene_point_init (&p[2], 100, 0);
+  graphene_point_init (&p[3], 100, 0);
+  gsk_curve_init (&c, gsk_pathop_encode (GSK_PATH_CUBIC, p));
+
+  gsk_curve_get_start_tangent (&c, &t);
+  g_assert_true (graphene_vec2_near (&t, graphene_vec2_x_axis (), 0.0001));
+  gsk_curve_get_end_tangent (&c, &t);
+  g_assert_true (graphene_vec2_near (&t, graphene_vec2_x_axis (), 0.0001));
+
+  graphene_point_init (&p[0], 0, 0);
+  graphene_point_init (&p[1], 50, 0);
+  graphene_point_init (&p[2], 50, 0);
+  graphene_point_init (&p[3], 100, 0);
+  gsk_curve_init (&c, gsk_pathop_encode (GSK_PATH_CUBIC, p));
+
+  gsk_curve_get_start_tangent (&c, &t);
+  g_assert_true (graphene_vec2_near (&t, graphene_vec2_x_axis (), 0.0001));
+  gsk_curve_get_end_tangent (&c, &t);
+  g_assert_true (graphene_vec2_near (&t, graphene_vec2_x_axis (), 0.0001));
+}
+
 static gboolean
 near_one_point (const graphene_point_t *p,
                 const graphene_point_t *q,
@@ -286,6 +315,7 @@ main (int   argc,
 
   g_test_add_func ("/curve/special/conic-segment", test_conic_segment);
   g_test_add_func ("/curve/special/tangents", test_curve_tangents);
+  g_test_add_func ("/curve/special/degenerate-tangents", test_curve_degenerate_tangents);
   g_test_add_func ("/curve/special/intersections", test_curve_intersections);
 
   return g_test_run ();