diff --git a/src/gallium/drivers/nouveau/nv50/nv50_program.c b/src/gallium/drivers/nouveau/nv50/nv50_program.c
index dd67a19d30c..7c4cf066e1a 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_program.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_program.c
@@ -71,6 +71,9 @@ nv50_vertprog_assign_slots(struct nv50_ir_prog_info_out *info)
          prog->vp.attrs[2] |= NV50_3D_VP_GP_BUILTIN_ATTR_EN_VERTEX_ID;
          prog->vp.attrs[2] |= NV50_3D_VP_GP_BUILTIN_ATTR_EN_VERTEX_ID_DRAW_ARRAYS_ADD_START;
          continue;
+      case TGSI_SEMANTIC_PRIMID:
+         prog->vp.attrs[2] |= NV50_3D_VP_GP_BUILTIN_ATTR_EN_PRIMITIVE_ID;
+         break;
       default:
          break;
       }