diff --git a/CHANGELOG.md b/CHANGELOG.md
index 468795dc..37c79036 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 **Under development**
 
+- fix: avoid regenerating OSM when population changes
 - feat: add municipality information to households and activities
 - chore: update to `eqasim-java` commit `ece4932`
 - feat: vehicles and vehicle types are now always generated
diff --git a/matsim/scenario/supply/osm.py b/matsim/scenario/supply/osm.py
index b9e79d3a..f723104e 100644
--- a/matsim/scenario/supply/osm.py
+++ b/matsim/scenario/supply/osm.py
@@ -6,13 +6,13 @@ def configure(context):
     context.stage("matsim.runtime.java")
     context.stage("matsim.runtime.pt2matsim")
     context.stage("data.osm.cleaned")
-    context.stage("synthesis.population.spatial.home.locations")
+    context.stage("data.spatial.iris")
 
     context.config("export_detailed_network", False)
 
 def execute(context):
     osm_path = "%s/output.osm.gz" % context.path("data.osm.cleaned")
-    crs = context.stage("synthesis.population.spatial.home.locations").crs
+    crs = context.stage("data.spatial.iris").crs
 
     pt2matsim.run(context, "org.matsim.pt2matsim.run.CreateDefaultOsmConfig", 
         arguments=["config_template.xml"]