diff --git a/apps/opencs/view/render/terrainshapemode.cpp b/apps/opencs/view/render/terrainshapemode.cpp
index bc0a2650f..5f5a60da2 100644
--- a/apps/opencs/view/render/terrainshapemode.cpp
+++ b/apps/opencs/view/render/terrainshapemode.cpp
@@ -388,7 +388,7 @@ void CSVRender::TerrainShapeMode::applyTerrainEditChanges()
     mAlteredCells.clear();
 }
 
-float CSVRender::TerrainShapeMode::calculateBumpShape(const float& distance, int radius, const float& height)
+float CSVRender::TerrainShapeMode::calculateBumpShape(float distance, int radius, float height)
 {
     float distancePerRadius = distance / radius;
     return height - height * (3 * distancePerRadius * distancePerRadius - 2 * distancePerRadius * distancePerRadius * distancePerRadius);
diff --git a/apps/opencs/view/render/terrainshapemode.hpp b/apps/opencs/view/render/terrainshapemode.hpp
index 6e6589c86..8e2a616c9 100644
--- a/apps/opencs/view/render/terrainshapemode.hpp
+++ b/apps/opencs/view/render/terrainshapemode.hpp
@@ -102,7 +102,7 @@ namespace CSVRender
             void editTerrainShapeGrid (const std::pair<int, int>& vertexCoords, bool dragOperation);
 
             /// Calculate height, when aiming for bump-shaped terrain change
-            float calculateBumpShape(const float& distance, int radius, const float& height);
+            float calculateBumpShape(float distance, int radius, float height);
 
             /// set the target height for flatten tool
             void setFlattenToolTargetHeight(const WorldspaceHitResult& hit);