diff --git a/src/apps/installer/CopyEngine.cpp b/src/apps/installer/CopyEngine.cpp
index cc67f4bc9b..d6ab6c1caa 100644
--- a/src/apps/installer/CopyEngine.cpp
+++ b/src/apps/installer/CopyEngine.cpp
@@ -15,14 +15,6 @@
 #include <String.h>
 #include <VolumeRoster.h>
 
-namespace BPrivate {
-
-extern status_t FSCopyFolder(BEntry *srcEntry, BDirectory *destDir, CopyLoopControl *loopControl,
-	BPoint *loc, bool makeOriginalName, Undo &undo);
-} // namespace BPrivate
-
-using namespace BPrivate;
-
 extern void SizeAsString(off_t size, char *string);
 
 class SourceVisitor : public BDiskDeviceVisitor 
diff --git a/src/apps/installer/FSUtils.h b/src/apps/installer/FSUtils.h
index acb4288e9d..5e87dcab23 100644
--- a/src/apps/installer/FSUtils.h
+++ b/src/apps/installer/FSUtils.h
@@ -150,6 +150,8 @@ TrackerCopyLoopControl::TrackerCopyLoopControl(thread_id thread)
 #endif
 _IMPEXP_TRACKER status_t FSCopyAttributesAndStats(BNode *, BNode *);
 
+_IMPEXP_TRACKER status_t FSCopyFolder(BEntry *srcEntry, BDirectory *destDir, CopyLoopControl *loopControl,
+	BPoint *loc, bool makeOriginalName, Undo &undo);
 _IMPEXP_TRACKER void FSDuplicate(BObjectList<entry_ref> *srcList, BList *pointList);
 _IMPEXP_TRACKER void FSMoveToFolder(BObjectList<entry_ref> *srcList, BEntry *, uint32 moveMode,
 	BList *pointList = NULL);
diff --git a/src/apps/installer/InstallerCopyLoopControl.h b/src/apps/installer/InstallerCopyLoopControl.h
index 26bebd9177..b3ec64364e 100644
--- a/src/apps/installer/InstallerCopyLoopControl.h
+++ b/src/apps/installer/InstallerCopyLoopControl.h
@@ -7,6 +7,7 @@
 #ifndef _INSTALLERCOPYLOOPCONTROL_H
 #define _INSTALLERCOPYLOOPCONTROL_H
 
+#include "FSUndoRedo.h"
 #include "FSUtils.h"
 class InstallerWindow;