diff --git a/rts/Sim/Units/UnitTypes/Builder.cpp b/rts/Sim/Units/UnitTypes/Builder.cpp
index 8559220..27529db 100644
--- a/rts/Sim/Units/UnitTypes/Builder.cpp
+++ b/rts/Sim/Units/UnitTypes/Builder.cpp
@@ -229,6 +229,10 @@ bool CBuilder::UpdateTerraform(const Command&)
 			SmoothBorders();
 
 			if (curBuildee->terraformLeft <= 0.0f) {
+				// Short jobs can finish before SlowUpdate. Publish the final heights
+				// while the build still owns its complete smoothed footprint.
+				constexpr int tsr = TERRA_SMOOTHING_RADIUS;
+				mapDamage->RecalcArea(tx1 - tsr, tx2 + tsr, tz1 - tsr, tz2 + tsr);
 				terraforming = false;
 				curBuildee->groundLevelled = true;
 
@@ -261,7 +265,7 @@ bool CBuilder::UpdateTerraform(const Command&)
 		SmoothBorders();
 
 		if (myTerraformLeft <= 0.0f) {
-			terraforming = false;
+			// StopBuild recalculates the restored area while terraforming is true.
 			StopBuild();
 		}
 	} break;