diff --git a/src/mesa/state_tracker/st_atom_array.c b/src/mesa/state_tracker/st_atom_array.c
index 38e78237cc3..fe6af915329 100644
--- a/src/mesa/state_tracker/st_atom_array.c
+++ b/src/mesa/state_tracker/st_atom_array.c
@@ -56,7 +56,7 @@
 static void ALWAYS_INLINE
 init_velement(struct pipe_vertex_element *velements,
               const struct gl_vertex_format *vformat,
-              int src_offset, int instance_divisor,
+              int src_offset, unsigned instance_divisor,
               int vbo_index, bool dual_slot, int idx)
 {
    velements[idx].src_offset = src_offset;