diff --git a/pyperformance/data-files/benchmarks/MANIFEST b/pyperformance/data-files/benchmarks/MANIFEST
index 05e1bf5e..6c5d6e07 100644
--- a/pyperformance/data-files/benchmarks/MANIFEST
+++ b/pyperformance/data-files/benchmarks/MANIFEST
@@ -10,6 +10,8 @@ async_tree_memoization	<local:async_tree>
 concurrent_imap	<local>
 coroutines	<local>
 coverage	<local>
+gc_traversal	<local>
+gc_collect	<local>
 generators	<local>
 chameleon	<local>
 chaos	<local>
diff --git a/pyperformance/data-files/benchmarks/bm_gc_collect/run_benchmark.py b/pyperformance/data-files/benchmarks/bm_gc_collect/run_benchmark.py
index db0e4153..d7014a56 100644
--- a/pyperformance/data-files/benchmarks/bm_gc_collect/run_benchmark.py
+++ b/pyperformance/data-files/benchmarks/bm_gc_collect/run_benchmark.py
@@ -53,7 +53,7 @@ def benchamark_collection(loops, cycles, links):
         collected = gc.collect()
         total_time += pyperf.perf_counter() - t0
 
-        assert collected >= cycles * (links + 1)
+        assert collected is None or collected >= cycles * (links + 1)
 
     return total_time
 
diff --git a/pyperformance/data-files/benchmarks/bm_gc_traversal/run_benchmark.py b/pyperformance/data-files/benchmarks/bm_gc_traversal/run_benchmark.py
index 244a6a75..797bd60d 100644
--- a/pyperformance/data-files/benchmarks/bm_gc_traversal/run_benchmark.py
+++ b/pyperformance/data-files/benchmarks/bm_gc_traversal/run_benchmark.py
@@ -26,7 +26,7 @@ def benchamark_collection(loops, n_levels):
         collected = gc.collect()
         total_time += pyperf.perf_counter() - t0
 
-        assert collected == 0
+        assert collected is None or collected == 0
 
     return total_time