diff --git a/rts/Game/Game.cpp b/rts/Game/Game.cpp
index 07dfe07f80..1ca90d6fa0 100644
--- a/rts/Game/Game.cpp
+++ b/rts/Game/Game.cpp
@@ -440,6 +440,7 @@ void CGame::Load(const std::string& mapFileName)
 			ENTER_SYNCED_CODE();
 			eventHandler.GamePreload();
 			eventHandler.CollectGarbage(true);
+			readMap->UpdateHeightBounds(); //needed in case pre-game terraform changed the map
 			LEAVE_SYNCED_CODE();
 		}
 
diff --git a/rts/Map/ReadMap.cpp b/rts/Map/ReadMap.cpp
index 114ec1e2f0..60d9d84edb 100644
--- a/rts/Map/ReadMap.cpp
+++ b/rts/Map/ReadMap.cpp
@@ -746,6 +746,22 @@ void CReadMap::UpdateHeightBounds(int syncFrame)
 #endif
 }
 
+void CReadMap::UpdateHeightBounds()
+{
+	const float* heightmap = GetCornerHeightMapSynced();
+
+	tempHeightBounds.x = std::numeric_limits<float>::max();
+	tempHeightBounds.y = std::numeric_limits<float>::lowest();
+
+	for (int i = 0; i < (mapDims.mapxp1 * mapDims.mapyp1); ++i) {
+		tempHeightBounds.x = std::min(tempHeightBounds.x, heightmap[i]);
+		tempHeightBounds.y = std::max(tempHeightBounds.y, heightmap[i]);
+	}
+
+	currHeightBounds.x = tempHeightBounds.x;
+	currHeightBounds.y = tempHeightBounds.y;
+}
+
 void CReadMap::UpdateCenterHeightmap(const SRectangle& rect, bool initialize)
 {
 	const float* heightmapSynced = GetCornerHeightMapSynced();
diff --git a/rts/Map/ReadMap.h b/rts/Map/ReadMap.h
index 5017843fbd..af944ad02f 100644
--- a/rts/Map/ReadMap.h
+++ b/rts/Map/ReadMap.h
@@ -208,6 +208,7 @@ class CReadMap
 	unsigned int CalcHeightmapChecksum();
 	unsigned int CalcTypemapChecksum();
 
+	void UpdateHeightBounds();
 private:
 	void InitHeightBounds();
 	void UpdateHeightBounds(int syncFrame);