diff --git a/src/top.c b/src/top.c
index ff5fa000..980cc4c8 100644
--- a/src/top.c
+++ b/src/top.c
@@ -948,9 +948,11 @@ void print_top(struct text_object *obj, char *p, int top_name_width)
 		case OBJ_top_time:
 			needed = cur->time;
 			break;
+#ifdef IOSTATS
 		case OBJ_top_io:
 			needed = cur->io;
 			break;
+#endif /* IOSTATS */
 		default:
 			return;
 	}