1 files changed, 4 insertions, 0 deletions
diff --git a/libpqpp/pq-binarycolumn.h b/libpqpp/pq-binarycolumn.h
index 402d0bb..ed6eae7 100644
--- a/libpqpp/pq-binarycolumn.h
+++ b/libpqpp/pq-binarycolumn.h
@@ -3,7 +3,11 @@
 
 #include "pq-column.h"
 
+namespace DB {
+	class HandleField;
+}
 namespace PQ {
+	class SelectBase;
 	class BinaryColumn : public Column {
 	public:
 		BinaryColumn(const SelectBase *, unsigned int field);