diff --git a/src/compiler/nir/nir_lower_flatshade.c b/src/compiler/nir/nir_lower_flatshade.c
index 6edfd490261..0e583bdb8d6 100644
--- a/src/compiler/nir/nir_lower_flatshade.c
+++ b/src/compiler/nir/nir_lower_flatshade.c
@@ -45,5 +45,7 @@ nir_lower_flatshade(nir_shader *shader)
       progress |= lower_input(shader, var);
    }
 
+   /* Interpolation doesn't affect any metadata */
+   nir_shader_preserve_all_metadata(shader);
    return progress;
 }