diff --git a/cpp/src/rolling/window_utils.cu b/cpp/src/rolling/window_utils.cu
index 0150e2e9ede..d2b53f5542f 100644
--- a/cpp/src/rolling/window_utils.cu
+++ b/cpp/src/rolling/window_utils.cu
@@ -153,7 +153,7 @@ struct window_offset_impl {
         d_length, d_offset, input_begin, input_end});
     } else {
       // Unreachable.
-      CUDF_FAIL("Unhandled window type.");
+      CUDF_UNREACHABLE("Unhandled window type.");
     }
     return result;
   }