diff --git a/src/jrd/recsrc/FilteredStream.cpp b/src/jrd/recsrc/FilteredStream.cpp
index 9f1e6dcf9f..d3fa6209fc 100644
--- a/src/jrd/recsrc/FilteredStream.cpp
+++ b/src/jrd/recsrc/FilteredStream.cpp
@@ -50,9 +50,13 @@ FilteredStream::FilteredStream(CompilerScratch* csb, RecordSource* next,
 
 	m_impure = csb->allocImpure<Impure>();
 
-	const auto cardinality = next->getCardinality();
-	Optimizer::adjustSelectivity(selectivity, MAXIMUM_SELECTIVITY, cardinality);
-	m_cardinality = cardinality * selectivity;
+	auto cardinality = next->getCardinality();
+	if (selectivity)
+	{
+		Optimizer::adjustSelectivity(selectivity, MAXIMUM_SELECTIVITY, cardinality);
+		cardinality *= selectivity;
+	}
+	m_cardinality = cardinality;
 }
 
 void FilteredStream::internalOpen(thread_db* tdbb) const
diff --git a/src/jrd/recsrc/RecordSource.h b/src/jrd/recsrc/RecordSource.h
index 0d0d5b6044..ee65daf6f1 100644
--- a/src/jrd/recsrc/RecordSource.h
+++ b/src/jrd/recsrc/RecordSource.h
@@ -575,7 +575,7 @@ namespace Jrd
 	{
 	public:
 		FilteredStream(CompilerScratch* csb, RecordSource* next,
-					   BoolExprNode* boolean, double selectivity);
+					   BoolExprNode* boolean, double selectivity = 0);
 
 		void close(thread_db* tdbb) const override;
 
@@ -623,7 +623,7 @@ namespace Jrd
 	public:
 		PreFilteredStream(CompilerScratch* csb, RecordSource* next,
 						  BoolExprNode* boolean)
-			: FilteredStream(csb, next, boolean, next->getCardinality())
+			: FilteredStream(csb, next, boolean)
 		{
 			m_invariant = true;
 		}