diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
index cab0dd8e0b7..dc9cce5cf23 100644
--- a/src/mesa/drivers/common/meta.c
+++ b/src/mesa/drivers/common/meta.c
@@ -2614,6 +2614,7 @@ _mesa_meta_setup_texture_coords(GLenum faceTarget,
             break;
          default:
             assert(0);
+            unreachable();
          }
 
          coord[3] = (float) (slice / 6);