diff --git a/src/system/UniqueFileDescriptor.hxx b/src/system/UniqueFileDescriptor.hxx
index d1827d3bb..1e77b0641 100644
--- a/src/system/UniqueFileDescriptor.hxx
+++ b/src/system/UniqueFileDescriptor.hxx
@@ -100,6 +100,7 @@ public:
 	using FileDescriptor::EnableCloseOnExec;
 	using FileDescriptor::DisableCloseOnExec;
 	using FileDescriptor::Duplicate;
+	using FileDescriptor::CheckDuplicate;
 
 	static bool CreatePipe(FileDescriptor &r, FileDescriptor &w);
 #endif