diff --git a/test/coverage.c b/test/coverage.c
index f6626f3d0..0749fa22a 100644
--- a/test/coverage.c
+++ b/test/coverage.c
@@ -491,7 +491,8 @@ CAIRO_TEST (coverage_column_triangles,
 	    "Check the fidelity of the rasterisation.",
 	    NULL, /* keywords */
 	    "target=raster", /* requirements */
-	    WIDTH, HEIGHT,
+	    /* Smaller height since this test does not vary by y-coordinate */
+	    WIDTH, 4,
 	    NULL, column_triangles)
 CAIRO_TEST (coverage_triangles,
 	    "Check the fidelity of the rasterisation.",
diff --git a/test/reference/coverage-column-triangles.ref.png b/test/reference/coverage-column-triangles.ref.png
index aa61031b7..24ccc9f2a 100644
Binary files a/test/reference/coverage-column-triangles.ref.png and b/test/reference/coverage-column-triangles.ref.png differ
diff --git a/test/reference/coverage-column-triangles.xfail.png b/test/reference/coverage-column-triangles.xfail.png
index 566b41544..9af5253c5 100644
Binary files a/test/reference/coverage-column-triangles.xfail.png and b/test/reference/coverage-column-triangles.xfail.png differ
diff --git a/test/reference/coverage-column-triangles.xlib.xfail.png b/test/reference/coverage-column-triangles.xlib.xfail.png
index f433b7a84..18e4af2da 100644
Binary files a/test/reference/coverage-column-triangles.xlib.xfail.png and b/test/reference/coverage-column-triangles.xlib.xfail.png differ