diff --git a/helloRay.cpp b/helloRay.cpp
index b29cd9f..0ba8938 100644
--- a/helloRay.cpp
+++ b/helloRay.cpp
@@ -84,6 +84,7 @@ int main()
   camera.resolution.y = 88;
 
   // This specifies the ray behavior.
+  RCL_initRayConstraints(&constraints);
   constraints.maxHits = 1;   // Stop at first intersection with a wall.
   constraints.maxSteps = 20; // Trace maximum of 20 squares.