diff --git a/tools/modelwriter.h b/tools/modelwriter.h
index 88ccb948a9c..4f445cfe2a4 100644
--- a/tools/modelwriter.h
+++ b/tools/modelwriter.h
@@ -2007,6 +2007,7 @@ int ModelWriter::save(const char* parampath, const char* binpath)
             fprintf_param_value(" 3=%d", kdim)
             fprintf_param_value(" 4=%d", vdim)
             fprintf_param_value(" 5=%d", attn_mask)
+            fprintf_param_value(" 6=%e", scale)
 
             fwrite_weight_tag_data(op->q_weight_data, bp);
             fwrite_weight_data(op->q_bias_data, bp);