diff --git a/compiler/cpp/src/thrifty.yy b/compiler/cpp/src/thrifty.yy
index b71fd7e..381b434 100644
--- a/compiler/cpp/src/thrifty.yy
+++ b/compiler/cpp/src/thrifty.yy
@@ -677,7 +677,6 @@
         $$->annotations_ = $7->annotations_;
         delete $7;
       }
-      y_field_val = -1;
     }
 
 XsdAll:
@@ -727,7 +726,6 @@
       $4->set_name($2);
       $4->set_xception(true);
       $$ = $4;
-      y_field_val = -1;
     }
 
 Service:
@@ -788,7 +786,6 @@
       if ($1 != NULL) {
         $$->set_doc($1);
       }
-      y_field_val = -1;
     }
 
 Async:
@@ -830,6 +827,7 @@
 |
     {
       pdebug("FieldList -> ");
+      y_field_val = -1;
       $$ = new t_struct(g_program);
     }