diff --git a/game_re/binders/gh_auto_binder.h b/game_re/binders/gh_auto_binder.h
index 9a01cb3c..0e5a32f3 100644
--- a/game_re/binders/gh_auto_binder.h
+++ b/game_re/binders/gh_auto_binder.h
@@ -37,7 +37,12 @@ template <size_t Size> struct FieldBinder {
   }
 
   template <typename T> T *operator=(T *src) {
-    return reinterpret_cast<T *>(dst) = src;
+    union V {
+      T *a;
+      void* b;
+    };
+    V* trick = reinterpret_cast<V*>(this);
+    return trick->a = src;
   }
   ExpectedType& operator=(ExpectedType src) {
     return *reinterpret_cast<ExpectedType *>(dst) = src;
@@ -47,7 +52,7 @@ template <size_t Size> struct FieldBinder {
 template <size_t Offset, size_t Size>
 inline FieldBinder<Size> operator+(const void *str,
                                    Field<Offset, Size> offset) {
-  return FieldBinder<Size>{.dst = (uint8_t *)str + offset};
+  return FieldBinder<Size>{.dst = (uint8_t *)str + Offset};
 }
 
 #endif /* B8D59B54_1674_4C0F_AA2C_611385FF5D03 */
diff --git a/game_re/binders/gh_base.h b/game_re/binders/gh_base.h
index 2c1a6e71..92bfd085 100644
--- a/game_re/binders/gh_base.h
+++ b/game_re/binders/gh_base.h
@@ -43,8 +43,8 @@ typedef uint32_t cc_type_t;
 
 
 template <typename T0, typename T1>
-inline constexpr cc_type_t CONCAT12(T0 a, T1 b) {
-  return cc_type_t(a) << 16 | cc_type_t(b);
+inline constexpr undefined3 CONCAT12(T0 a, T1 b) {
+  return undefined3(cc_type_t(a) << 16 | cc_type_t(b));
 }
 template <typename T0, typename T1>
 inline constexpr cc_type_t CONCAT11(T0 a, T1 b) {