diff --git a/cpp/src/rolling/grouped_rolling.cu b/cpp/src/rolling/grouped_rolling.cu
index 88253a3f4ea..b8cb5e45fec 100644
--- a/cpp/src/rolling/grouped_rolling.cu
+++ b/cpp/src/rolling/grouped_rolling.cu
@@ -128,8 +128,7 @@ std::unique_ptr<column> grouped_rolling_window(table_view const& group_keys,
   //   3. [0, 500, 1000] indicates two equal-sized groups: [0,500), and [500,1000).
 
   assert(group_offsets.size() >= 2 && group_offsets.element(0, stream) == 0 &&
-         group_offsets.element(group_offsets.size() - 1, stream) ==
-           input.size() &&
+         group_offsets.element(group_offsets.size() - 1, stream) == input.size() &&
          "Must have at least one group.");
 
   auto preceding_calculator = [d_group_offsets = group_offsets.data(),