diff --git a/src/voxels/voxel.h b/src/voxels/voxel.h
index 66026f8b..65fe32db 100644
--- a/src/voxels/voxel.h
+++ b/src/voxels/voxel.h
@@ -3,12 +3,12 @@
 
 #include "../typedefs.h"
 
-#define BLOCK_DIR_X 0x1
-#define BLOCK_DIR_Y 0x0
-#define BLOCK_DIR_Z 0x2
+const int BLOCK_DIR_X = 0x1;
+const int BLOCK_DIR_Y = 0x0;
+const int BLOCK_DIR_Z = 0x2;
 
 // limited to 16 block orientations
-#define BLOCK_ROT_MASK 0xF
+const int BLOCK_ROT_MASK = 0xF;
 
 struct voxel {
 	blockid_t id;