diff --git a/README.md b/README.md
index f63c9bbb..9e6f8b8a 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,7 @@ The fastest and most memory efficient lattice Boltzmann CFD software, running on
   - fixed erroneous double literal for Intel iGPUs in skybox color functions
   - fixed bug in make.sh where multi-GPU device IDs would not get forwarded to the executable
   - minor bug fixes in graphics engine (free cursor not centered during rotation, labels in VR mode)
+  - fixed bug in LBM::voxelize_stl() size parameter standard initialization
 
 </details>
 
diff --git a/src/lbm.hpp b/src/lbm.hpp
index d2e44b3e..d6c2ab01 100644
--- a/src/lbm.hpp
+++ b/src/lbm.hpp
@@ -473,10 +473,10 @@ class LBM {
 
 	void voxelize_mesh_on_device(const Mesh* mesh, const uchar flag=TYPE_S, const float3& rotation_center=float3(0.0f), const float3& linear_velocity=float3(0.0f), const float3& rotational_velocity=float3(0.0f)); // voxelize mesh
 	void unvoxelize_mesh_on_device(const Mesh* mesh, const uchar flag=TYPE_S); // remove voxelized triangle mesh from LBM grid
-	void voxelize_stl(const string& path, const float3& center, const float3x3& rotation, const float size=-1.0f, const uchar flag=TYPE_S); // read and voxelize binary .stl file
-	void voxelize_stl(const string& path, const float3x3& rotation, const float size=-1.0f, const uchar flag=TYPE_S); // read and voxelize binary .stl file (place in box center)
-	void voxelize_stl(const string& path, const float3& center, const float size=-1.0f, const uchar flag=TYPE_S); // read and voxelize binary .stl file (no rotation)
-	void voxelize_stl(const string& path, const float size=-1.0f, const uchar flag=TYPE_S); // read and voxelize binary .stl file (place in box center, no rotation)
+	void voxelize_stl(const string& path, const float3& center, const float3x3& rotation, const float size=0.0f, const uchar flag=TYPE_S); // read and voxelize binary .stl file
+	void voxelize_stl(const string& path, const float3x3& rotation, const float size=0.0f, const uchar flag=TYPE_S); // read and voxelize binary .stl file (place in box center)
+	void voxelize_stl(const string& path, const float3& center, const float size=0.0f, const uchar flag=TYPE_S); // read and voxelize binary .stl file (no rotation)
+	void voxelize_stl(const string& path, const float size=0.0f, const uchar flag=TYPE_S); // read and voxelize binary .stl file (place in box center, no rotation)
 
 #ifdef GRAPHICS
 	class Graphics {