diff --git a/libwccl/ops/functions/bool/iterations/atleast.h b/libwccl/ops/functions/bool/iterations/atleast.h
index a2b756eee5034dcc7fea5666762293fc7b856a1b..d6af517147721e18f16d4d05f48d438d34226b0d 100644
--- a/libwccl/ops/functions/bool/iterations/atleast.h
+++ b/libwccl/ops/functions/bool/iterations/atleast.h
@@ -65,7 +65,7 @@ protected:
 	std::ostream& write_to(std::ostream& ostream) const;
 
 private:
-	int min_matches_;
+	const int min_matches_;
 };