diff --git a/chapter_08/lispy.c b/chapter_08/lispy.c
index 548f07b..fdcaee2 100644
--- a/chapter_08/lispy.c
+++ b/chapter_08/lispy.c
@@ -37,8 +37,8 @@ typedef struct {
     union {
         long num;
         double dec;
+        int err;
     };
-    int err;
 } lval;