diff --git a/headers/os/interface/Bitmap.h b/headers/os/interface/Bitmap.h
index 14d99dcbe7..1800a622bc 100644
--- a/headers/os/interface/Bitmap.h
+++ b/headers/os/interface/Bitmap.h
@@ -112,7 +112,7 @@ public:
 			void				SetBits(const void* data, int32 length,
 									int32 offset, color_space colorSpace);
 
-public:
+private:
 			status_t			ImportBits(const void* data, int32 length,
 									int32 bpr, color_space colorSpace,
 									BPoint from, BPoint to, int32 width, int32 height);