diff --git a/projects/voxelization/src/ShadowMapping.hpp b/projects/voxelization/src/ShadowMapping.hpp
index 8066d5bdc90a66c0823be4dc23cf6a12729e32c7..e0903ce2248bc2bc0321d4a601bae73ea3727b05 100644
--- a/projects/voxelization/src/ShadowMapping.hpp
+++ b/projects/voxelization/src/ShadowMapping.hpp
@@ -3,6 +3,7 @@
 #include <vkcv/camera/Camera.hpp>
 
 #include <glm/glm.hpp>
+#define GLM_ENABLE_EXPERIMENTAL // use this before inclusion, else error!
 #include <glm/gtx/transform.hpp>
 
 struct LightInfo {