diff --git a/kubejs/server_scripts/recipes/essentials/slabs.js b/kubejs/server_scripts/recipes/essentials/slabs.js
index 2d96710..dbc5ede 100644
--- a/kubejs/server_scripts/recipes/essentials/slabs.js
+++ b/kubejs/server_scripts/recipes/essentials/slabs.js
@@ -14,10 +14,10 @@ onEvent("recipes", event => {
     if (/^quark:.*limestone.*$/.test(output)) return;
 
     // ... add a recipe to craft slabs in 2x2 crafting grid.
-    event.shaped("4x " + output, [ "SS" ], { S: input });
+    event.shaped("4x " + output, [ "BB" ], { B: input });
     // For this to work, "pressure_plates_use_stabs.json" must also be present.
 
     // ... add a back-crafting recipe to turn 2x slab => 1x block.
-    event.shapeless(input, [ output, output ]);
+    event.shaped(input, [ "S ", " S" ], { S: output });
   });
 });