diff --git a/src/trace_processor/slice_tracker_unittest.cc b/src/trace_processor/slice_tracker_unittest.cc
index aa31be0..79a3b46 100644
--- a/src/trace_processor/slice_tracker_unittest.cc
+++ b/src/trace_processor/slice_tracker_unittest.cc
@@ -220,7 +220,7 @@
   EXPECT_EQ(context.storage->nestable_slices().depths()[0], 0);
   EXPECT_EQ(context.storage->nestable_slices().depths()[1], 0);
   EXPECT_EQ(context.storage->nestable_slices().depths()[2], 0);
-  EXPECT_NE(context.storage->nestable_slices().arg_set_ids()[2], 0);
+  EXPECT_NE(context.storage->nestable_slices().arg_set_ids()[2], 0u);
 }
 
 }  // namespace