diff --git a/src/util/u_idalloc.h b/src/util/u_idalloc.h
index fa488b18275..b5458907428 100644
--- a/src/util/u_idalloc.h
+++ b/src/util/u_idalloc.h
@@ -71,7 +71,7 @@ util_idalloc_reserve(struct util_idalloc *buf, unsigned id);
 
 #define util_idalloc_foreach(buf, id) \
    for (uint32_t _i = 0, _mask = (buf)->num_set_elements ? (buf)->data[0] : 0, id, \
-                 _count = (buf)->num_used; \
+                 _count = (buf)->num_set_elements; \
         _i < _count; _mask = ++_i < _count ? (buf)->data[_i] : 0) \
       while (_mask) \
          if ((id = _i * 32 + u_bit_scan(&_mask)), true)