diff --git a/src/util/u_dynarray.h b/src/util/u_dynarray.h
index 4f1092c2848..16d81495994 100644
--- a/src/util/u_dynarray.h
+++ b/src/util/u_dynarray.h
@@ -125,7 +125,7 @@ util_dynarray_resize_bytes(struct util_dynarray *buf, unsigned nelts, size_t elt
    if (unlikely(nelts > UINT_MAX / eltsize))
       return NULL;
 
-   unsigned newsize = nelts * eltsize;
+   unsigned newsize = nelts * (unsigned)eltsize;
    void *p = util_dynarray_ensure_cap(buf, newsize);
    if (!p)
       return NULL;
@@ -147,7 +147,7 @@ util_dynarray_clone(struct util_dynarray *buf, void *mem_ctx,
 MUST_CHECK static inline void *
 util_dynarray_grow_bytes(struct util_dynarray *buf, unsigned ngrow, size_t eltsize)
 {
-   unsigned growbytes = ngrow * eltsize;
+   unsigned growbytes = ngrow * (unsigned)eltsize;
 
    if (unlikely(ngrow > (UINT_MAX / eltsize) ||
                 growbytes > UINT_MAX - buf->size))