diff --git a/keen.c b/keen.c
index b8c73fb..1446740 100644
--- a/keen.c
+++ b/keen.c
@@ -2257,7 +2257,7 @@ static void outline_block_structure(drawing *dr, game_drawstate *ds,
      * Iterate over all the blocks.
      */
     for (i = 0; i < a; i++) {
-	if (dsf_canonify(dsf, i) != i)
+	if (dsf_minimal(dsf, i) != i)
 	    continue;
 
 	/*
@@ -2296,11 +2296,11 @@ static void outline_block_structure(drawing *dr, game_drawstate *ds,
 	    tx = x - dy + dx;
 	    ty = y + dx + dy;
 	    nin += (tx >= 0 && tx < w && ty >= 0 && ty < w &&
-		    dsf_canonify(dsf, ty*w+tx) == i);
+		    dsf_minimal(dsf, ty*w+tx) == i);
 	    tx = x - dy;
 	    ty = y + dx;
 	    nin += (tx >= 0 && tx < w && ty >= 0 && ty < w &&
-		    dsf_canonify(dsf, ty*w+tx) == i);
+		    dsf_minimal(dsf, ty*w+tx) == i);
 	    if (nin == 0) {
 		/*
 		 * Turn right.
@@ -2337,9 +2337,9 @@ static void outline_block_structure(drawing *dr, game_drawstate *ds,
 	     * somewhere sensible.
 	     */
 	    assert(x >= 0 && x < w && y >= 0 && y < w &&
-		   dsf_canonify(dsf, y*w+x) == i);
+		   dsf_minimal(dsf, y*w+x) == i);
 	    assert(x+dx < 0 || x+dx >= w || y+dy < 0 || y+dy >= w ||
-		   dsf_canonify(dsf, (y+dy)*w+(x+dx)) != i);
+		   dsf_minimal(dsf, (y+dy)*w+(x+dx)) != i);
 
 	    /*
 	     * Record the point we just went past at one end of the