diff --git a/examples/convert-llama2c-to-ggml/convert-llama2c-to-ggml.cpp b/examples/convert-llama2c-to-ggml/convert-llama2c-to-ggml.cpp
index a066575a3..3154110de 100644
--- a/examples/convert-llama2c-to-ggml/convert-llama2c-to-ggml.cpp
+++ b/examples/convert-llama2c-to-ggml/convert-llama2c-to-ggml.cpp
@@ -534,7 +534,7 @@ struct llama_file {
         }
     }
 
-    void write_u32(std::uint32_t val) {
+    void write_u32(std::uint32_t val) const {
         write_raw(&val, sizeof(val));
     }