diff --git a/recipes/fuchsia/fuchsia.expected/child_build_provided.json b/recipes/fuchsia/fuchsia.expected/child_build_provided.json
index 01dd32e..7b2ec3a 100644
--- a/recipes/fuchsia/fuchsia.expected/child_build_provided.json
+++ b/recipes/fuchsia/fuchsia.expected/child_build_provided.json
@@ -1747,7 +1747,6 @@
       "vpython3",
       "[CLEANUP]/test-orchestration-inputs_tmp_1/perfcompare/perfcompare.py",
       "compare_perf",
-      "--expected_sample_size=1",
       "[CLEANUP]/perf_dataset/with_cl"
     ],
     "luci_context": {
diff --git a/recipes/fuchsia/fuchsia.expected/successful_build_and_test.json b/recipes/fuchsia/fuchsia.expected/successful_build_and_test.json
index 4de671e..0d42648 100644
--- a/recipes/fuchsia/fuchsia.expected/successful_build_and_test.json
+++ b/recipes/fuchsia/fuchsia.expected/successful_build_and_test.json
@@ -1875,7 +1875,6 @@
       "vpython3",
       "[CLEANUP]/test-orchestration-inputs_tmp_1/perfcompare/perfcompare.py",
       "compare_perf",
-      "--expected_sample_size=1",
       "[CLEANUP]/perf_dataset/with_cl"
     ],
     "luci_context": {
diff --git a/recipes/fuchsia/fuchsia.expected/successful_build_and_test_perfcompare.json b/recipes/fuchsia/fuchsia.expected/successful_build_and_test_perfcompare.json
index 5f28582..41187fe 100644
--- a/recipes/fuchsia/fuchsia.expected/successful_build_and_test_perfcompare.json
+++ b/recipes/fuchsia/fuchsia.expected/successful_build_and_test_perfcompare.json
@@ -4690,7 +4690,6 @@
       "vpython3",
       "[CLEANUP]/test-orchestration-inputs_tmp_1/perfcompare/perfcompare.py",
       "compare_perf",
-      "--expected_sample_size=2",
       "[CLEANUP]/perf_dataset/without_cl",
       "[CLEANUP]/perf_dataset/with_cl"
     ],
diff --git a/recipes/fuchsia/fuchsia.py b/recipes/fuchsia/fuchsia.py
index da2aaee..d676080 100644
--- a/recipes/fuchsia/fuchsia.py
+++ b/recipes/fuchsia/fuchsia.py
@@ -206,7 +206,6 @@
                 orchestration_inputs.perfcompare,
                 results_without_cl,
                 results_with_cl,
-                runs_per_shard,
             )
 
     if run_fxt_tests:
@@ -437,7 +436,7 @@
 
 
 def display_performance_results(
-    api, perfcompare_tool_dir, results_without_cl, results_with_cl, runs_per_shard
+    api, perfcompare_tool_dir, results_without_cl, results_with_cl
 ):
     dest_dir = api.path.cleanup_dir / "perf_dataset"
     with_cl_dir = dest_dir / "with_cl"
@@ -479,7 +478,6 @@
             "vpython3",
             perfcompare_tool_dir / "perfcompare.py",
             "compare_perf",
-            "--expected_sample_size=%d" % runs_per_shard,
         ]
         + dirs_to_display,
     )