diff --git a/libvo/vo_xv.c b/libvo/vo_xv.c
index 1a035d5f19..f90542be0d 100644
--- a/libvo/vo_xv.c
+++ b/libvo/vo_xv.c
@@ -59,8 +59,6 @@ LIBVO_EXTERN(xv)
 #include <sys/ipc.h>
 #include <sys/shm.h>
 #include <X11/extensions/XShm.h>
-/* since it doesn't seem to be defined on some platforms */
-int XShmGetEventBase(Display *);
 
 static XShmSegmentInfo Shminfo[NUM_BUFFERS];
 static int Shmem_Flag;