diff --git a/src/external/structuresynth-1.5/ssynth/SyntopiaCore/GLEngine/Raytracer/VoxelStepper.cpp b/src/external/structuresynth-1.5/ssynth/SyntopiaCore/GLEngine/Raytracer/VoxelStepper.cpp
index 65c66dbe1..14715d620 100644
--- a/src/external/structuresynth-1.5/ssynth/SyntopiaCore/GLEngine/Raytracer/VoxelStepper.cpp
+++ b/src/external/structuresynth-1.5/ssynth/SyntopiaCore/GLEngine/Raytracer/VoxelStepper.cpp
@@ -122,7 +122,7 @@ namespace SyntopiaCore {
 						currentT = p;
 
 						// We do not intersect grid.
-						if (!found) return 0; //nullptr;
+						if (!found) return nullptr;
 				}
 
 				stepX = (dir.x() > 0) ? 1 : -1;