1 files changed, 1 insertions, 0 deletions
diff --git a/ray.h b/ray.h
index 4d5401c..51a3da1 100644
--- a/ray.h
+++ b/ray.h
@@ -6,6 +6,7 @@
 #define RT_RAY_H
 
 #include "vec.h"
+#include "bitmap.h"
 
 // A ray is a half-line, starts from a 3d point, along the direction of a unit vector, to the infinity
 template<typename T>