diff --git a/Samples/5_Domain_Specific/dxtc/CudaMath.h b/Samples/5_Domain_Specific/dxtc/CudaMath.h
index c1ae0ac7d..076554e79 100644
--- a/Samples/5_Domain_Specific/dxtc/CudaMath.h
+++ b/Samples/5_Domain_Specific/dxtc/CudaMath.h
@@ -31,6 +31,7 @@
 #define CUDAMATH_H
 
 #include <cooperative_groups.h>
+#include <helper_math.h>
 
 namespace cg = cooperative_groups;