diff --git a/src/llama-vocab.cpp b/src/llama-vocab.cpp
index 749f8571829dfc..146fccf04ef6e0 100644
--- a/src/llama-vocab.cpp
+++ b/src/llama-vocab.cpp
@@ -207,7 +207,8 @@ struct llm_tokenizer_spm {
         }
 
         // seed the work queue with all possible 2-character tokens.
-        for (size_t i = 1; i < symbols.size(); ++i) {
+        int symbols_size = static_cast<int>(symbols.size());
+        for (int i = 1; i < symbols_size; ++i) {
             try_add_bigram(i - 1, i);
         }
 
@@ -511,7 +512,8 @@ struct llm_tokenizer_bpe {
                 index++;
                 symbols.emplace_back(sym);
             }
-            for (size_t i = 1; i < symbols.size(); ++i) {
+            int symbols_size = static_cast<int>(symbols.size());
+            for (int i = 1; i < symbols.size(); ++i) {
                 add_new_bigram(i - 1, i);
             }