diff --git a/src/mesa/drivers/dri/nouveau/nv10_swtcl.c b/src/mesa/drivers/dri/nouveau/nv10_swtcl.c
index 79ee29cfa56..510704f7d45 100644
--- a/src/mesa/drivers/dri/nouveau/nv10_swtcl.c
+++ b/src/mesa/drivers/dri/nouveau/nv10_swtcl.c
@@ -664,7 +664,7 @@ static inline void nv10OutputVertexFormat(struct nouveau_context* nmesa, GLuint
 		if (index&(1<<i))
 		{
 			slots=i+1;
-			if (i==0)
+			if (i==_TNL_ATTRIB_POS)
 			{
 				/* special-case POS */
 				EMIT_ATTR(_TNL_ATTRIB_POS,EMIT_3F_VIEWPORT);