diff --git a/src/Floorplan.hs b/src/Floorplan.hs
index 03e08b7..10e3cf6 100644
--- a/src/Floorplan.hs
+++ b/src/Floorplan.hs
@@ -95,7 +95,7 @@ placeHalls rng fc input =
                 (nw, g3)    = randomR (2, wmax) g2
                 (nbs, nmat) = buildHall cross nw b amat
             in
-              if hallRatio nmat < 0.4 && wmax - 1 > 2
+              if hallRatio nmat < 0.175 && wmax - 1 > 2
               then doHalls g3 nbs (row, col) (wmax -1) nmat
               else (g3, nmat)
             ) (rand, mat) bounds