diff --git a/src/mesa/drivers/dri/i965/brw_program.c b/src/mesa/drivers/dri/i965/brw_program.c
index be839ab38a2..6aa41009e74 100644
--- a/src/mesa/drivers/dri/i965/brw_program.c
+++ b/src/mesa/drivers/dri/i965/brw_program.c
@@ -796,6 +796,7 @@ brw_program_serialize_nir(struct gl_context *ctx, struct gl_program *prog)
    prog->driver_cache_blob = ralloc_size(NULL, writer.size);
    memcpy(prog->driver_cache_blob, writer.data, writer.size);
    prog->driver_cache_blob_size = writer.size;
+   blob_finish(&writer);
 }
 
 void