diff --git a/src/cairo-bentley-ottmann-rectangular.c b/src/cairo-bentley-ottmann-rectangular.c
index 65f95d797..be01e04f7 100644
--- a/src/cairo-bentley-ottmann-rectangular.c
+++ b/src/cairo-bentley-ottmann-rectangular.c
@@ -847,6 +847,8 @@ _cairo_bentley_ottmann_tessellate_boxes (const cairo_boxes_t *in,
 		rectangles[j].left.x = box[i].p2.x;
 		rectangles[j].left.dir = -1;
 	    }
+	    if (rectangles[j].left.x == INT32_MAX) rectangles[j].left.x = INT32_MAX-1;
+	    if (rectangles[j].right.x == INT32_MAX) rectangles[j].right.x = INT32_MAX-1;
 
 	    rectangles[j].left.right = NULL;
 	    rectangles[j].right.right = NULL;