diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 8e8c392..7a7cfe8 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1353,7 +1353,7 @@
 				/* IRQ support (drm_irq.h) */
 extern int drm_control(struct drm_device *dev, void *data,
 		       struct drm_file *file_priv);
-extern int drm_irq_install(struct drm_device *dev);
+extern int drm_irq_install(struct drm_device *dev, int irq);
 extern int drm_irq_uninstall(struct drm_device *dev);
 
 extern int drm_vblank_init(struct drm_device *dev, int num_crtcs);