diff --git a/cuda_core/examples/saxpy.py b/cuda_core/examples/saxpy.py
index 347015681..225531141 100644
--- a/cuda_core/examples/saxpy.py
+++ b/cuda_core/examples/saxpy.py
@@ -18,7 +18,7 @@
                       size_t N) {
     const unsigned int tid = threadIdx.x + blockIdx.x * blockDim.x;
     for (size_t i=tid; i<N; i+=gridDim.x*blockDim.x) {
-        out[tid] = a * x[tid] + y[tid];
+        out[i] = a * x[i] + y[i];
     }
 }
 """