diff --git a/src/sec_certs/sample/fips.py b/src/sec_certs/sample/fips.py
index cee8cb9d..ce2e6907 100644
--- a/src/sec_certs/sample/fips.py
+++ b/src/sec_certs/sample/fips.py
@@ -459,7 +459,7 @@ def algorithm_numbers(self) -> set[str]:
             def alg_to_number(alg: str) -> str:
                 return "".join([x for x in alg.split("#")[1] if x.isdigit()])
 
-            return {alg_to_number(x) for x in self.algorithms}
+            return {alg_to_number(x) for x in self.algorithms if "#" in x}
 
     @property
     def dgst(self) -> str: