diff --git a/games/age-of-dwarves/guide/src/pages/PopulationDashboardPage.tsx b/games/age-of-dwarves/guide/src/pages/PopulationDashboardPage.tsx
index ee2577fe..ebd7ba19 100644
--- a/games/age-of-dwarves/guide/src/pages/PopulationDashboardPage.tsx
+++ b/games/age-of-dwarves/guide/src/pages/PopulationDashboardPage.tsx
@@ -4,7 +4,7 @@ import { FadeIn, PageTitle, Section, SectionHeading, Prose, FilterRow, FilterChi
 import { Heading, Text } from '@lilith/ui-typography'
 import { ALL_BIOMES, BIOME_MAP, QUALITY_COLORS } from '@/data/ecology'
 import type { GridState, TileState } from '@magic-civ/engine-ts'
-import { classifyBiome } from '@magic-civ/engine-ts'
+import { classifyBiome, DEFAULT_DT } from '@magic-civ/engine-ts'
 import { WasmEcologyPhysics, WasmGrid } from '@magic-civ/physics-rs'
 
 const W = 30
@@ -140,7 +140,7 @@ function useSimulation(): TurnRecord[] {
 
     const wg = WasmGrid.fromJSON(grid)
     for (let t = 1; t <= MAX_TURNS; t++) {
-      eco.processStep(wg)
+      eco.processStep(wg, DEFAULT_DT)
       if (t % 5 === 0 || t <= 10 || t === MAX_TURNS) {
         grid = wg.toJSON() as GridState
         records.push(recordTurn(grid, t))