diff --git a/headers/os/add-ons/graphics/GraphicsCard.h b/headers/os/add-ons/graphics/GraphicsCard.h
index 2c8ef662f2..dfa04ca830 100644
--- a/headers/os/add-ons/graphics/GraphicsCard.h
+++ b/headers/os/add-ons/graphics/GraphicsCard.h
@@ -146,22 +146,6 @@ int32 control_graphics_card(uint32, void*);
 #endif
 
 
-/* #pragma mark - debugging functions */
-
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-void dprintf(const char *format, ...);
-bool set_dprintf_enabled(bool);
-	/* returns old enable flag */
-
-#ifdef __cplusplus
-}
-#endif
-
-
 /* #pragma mark - deprecated */
 #define B_HOOK_COUNT  B_GRAPHICS_HOOK_COUNT