diff --git a/src/apps/mediaplayer/playlist/CopyPLItemsCommand.h b/src/apps/mediaplayer/playlist/CopyPLItemsCommand.h
index e943c916ed..099c8c6d5b 100644
--- a/src/apps/mediaplayer/playlist/CopyPLItemsCommand.h
+++ b/src/apps/mediaplayer/playlist/CopyPLItemsCommand.h
@@ -12,6 +12,7 @@
 #include "Command.h"
 
 class Playlist;
+struct entry_ref;
 
 class CopyPLItemsCommand : public Command {
  public:
diff --git a/src/apps/mediaplayer/playlist/ImportPLItemsCommand.h b/src/apps/mediaplayer/playlist/ImportPLItemsCommand.h
index 6f15b62922..9d22726543 100644
--- a/src/apps/mediaplayer/playlist/ImportPLItemsCommand.h
+++ b/src/apps/mediaplayer/playlist/ImportPLItemsCommand.h
@@ -13,6 +13,7 @@
 
 class BMessage;
 class Playlist;
+struct entry_ref;
 
 class ImportPLItemsCommand : public Command {
  public:
diff --git a/src/apps/mediaplayer/playlist/MovePLItemsCommand.h b/src/apps/mediaplayer/playlist/MovePLItemsCommand.h
index ce3f460180..f093dd54c8 100644
--- a/src/apps/mediaplayer/playlist/MovePLItemsCommand.h
+++ b/src/apps/mediaplayer/playlist/MovePLItemsCommand.h
@@ -12,6 +12,7 @@
 #include "Command.h"
 
 class Playlist;
+struct entry_ref;
 
 class MovePLItemsCommand : public Command {
  public:
diff --git a/src/apps/mediaplayer/playlist/Playlist.h b/src/apps/mediaplayer/playlist/Playlist.h
index 2c4522d61e..f187e9122b 100644
--- a/src/apps/mediaplayer/playlist/Playlist.h
+++ b/src/apps/mediaplayer/playlist/Playlist.h
@@ -25,6 +25,8 @@
 #include <List.h>
 #include <Locker.h>
 
+class BMessage;
+
 class Playlist : public BLocker {
 public:
 	class Listener {
diff --git a/src/apps/mediaplayer/playlist/RemovePLItemsCommand.h b/src/apps/mediaplayer/playlist/RemovePLItemsCommand.h
index 6f310ef774..013130ac72 100644
--- a/src/apps/mediaplayer/playlist/RemovePLItemsCommand.h
+++ b/src/apps/mediaplayer/playlist/RemovePLItemsCommand.h
@@ -12,6 +12,7 @@
 #include "Command.h"
 
 class Playlist;
+struct entry_ref;
 
 class RemovePLItemsCommand : public Command {
  public: