1 files changed, 1 insertions, 0 deletions
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 7560a828b32..487e7e6f326 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -105,6 +105,7 @@ _mesa_varying_slot_in_fs(gl_varying_slot slot)
    case VARYING_SLOT_TESS_LEVEL_INNER:
    case VARYING_SLOT_BOUNDING_BOX0:
    case VARYING_SLOT_BOUNDING_BOX1:
+   case VARYING_SLOT_VIEWPORT_MASK:
       return GL_FALSE;
    default:
       return GL_TRUE;