diff --git a/capa/features/extractors/base_extractor.py b/capa/features/extractors/base_extractor.py
index 93115ca4..07a40846 100644
--- a/capa/features/extractors/base_extractor.py
+++ b/capa/features/extractors/base_extractor.py
@@ -128,6 +128,7 @@ class StaticFeatureExtractor:
         """
         raise NotImplementedError()
 
+    @abc.abstractmethod
     def get_sample_hashes(self) -> SampleHashes:
         """
         fetch the hashes for the sample contained within the extractor.