diff --git a/docs/changelog.txt b/docs/changelog.txt
index 6fffb49e54..21cce92940 100644
--- a/docs/changelog.txt
+++ b/docs/changelog.txt
@@ -61,6 +61,7 @@ Template for new versions:
 
 ## Fixes
 - Fixed ``scriptmanager.getModStatePath()`` causing scripts to crash when called
+- `prospect`: don't warn about a missing magma sea in the pre-embark estimate when the world was generated without one
 
 ## Misc Improvements
 
diff --git a/plugins/prospector.cpp b/plugins/prospector.cpp
index 5dd712e872..427d8d34e9 100644
--- a/plugins/prospector.cpp
+++ b/plugins/prospector.cpp
@@ -385,7 +385,8 @@ bool estimate_underground(color_ostream &out, EmbarkTileLayout &tile, df::world_
 
     if (!sea_found)
     {
-        out.printerr("Could not find magma sea; depth may be incorrect.\n");
+        if (world->worldgen.worldgen_parms.have_bottom_layer_1)
+            out.printerr("Could not find magma sea; depth may be incorrect.\n");
         tile.min_z = tile.base_z;
     }