diff --git a/capa/features/extractors/null.py b/capa/features/extractors/null.py
index 48798ee1..50bd8511 100644
--- a/capa/features/extractors/null.py
+++ b/capa/features/extractors/null.py
@@ -16,6 +16,7 @@ from capa.features.extractors.base_extractor import (
     BBHandle,
     CallHandle,
     InsnHandle,
+    SampleHashes,
     ThreadHandle,
     ProcessHandle,
     FunctionHandle,
@@ -50,6 +51,7 @@ class NullStaticFeatureExtractor(StaticFeatureExtractor):
     """
 
     base_address: Address
+    sample_hashes: SampleHashes
     global_features: List[Feature]
     file_features: List[Tuple[Address, Feature]]
     functions: Dict[Address, FunctionFeatures]
@@ -110,6 +112,7 @@ class ProcessFeatures:
 @dataclass
 class NullDynamicFeatureExtractor(DynamicFeatureExtractor):
     base_address: Address
+    sample_hashes: SampleHashes
     global_features: List[Feature]
     file_features: List[Tuple[Address, Feature]]
     processes: Dict[Address, ProcessFeatures]