diff --git a/ggml.c b/ggml.c
index 912a8ca2e..793b67f4c 100644
--- a/ggml.c
+++ b/ggml.c
@@ -20335,7 +20335,7 @@ size_t ggml_quantize_chunk(
                int64_t   nrows,
                int64_t   n_per_row,
            const float * imatrix) {
-    const size_t n = (size_t) nrows * n_per_row;
+    const int64_t n = (int64_t) nrows * n_per_row;
 
     if (ggml_quantize_requires_imatrix(type)) {
         GGML_ASSERT(imatrix != NULL);