diff --git a/src/gallium/drivers/r300/r300_vs.c b/src/gallium/drivers/r300/r300_vs.c
index 365ae218869..6e9c4cd65db 100644
--- a/src/gallium/drivers/r300/r300_vs.c
+++ b/src/gallium/drivers/r300/r300_vs.c
@@ -259,7 +259,7 @@ void r300_translate_vertex_shader(struct r300_context *r300,
 
     /* Insert the WPOS output. */
     if (vs->wpos)
-        rc_copy_output(&compiler.Base, 0, vs->outputs.wpos);
+        rc_copy_output(&compiler.Base, vs->outputs.pos, vs->outputs.wpos);
 
     /* Invoke the compiler */
     r3xx_compile_vertex_program(&compiler);