1 files changed, 3 insertions, 0 deletions
diff --git a/generic/tclInt.h b/generic/tclInt.h
index cf32e0d..67aee93 100644
--- a/generic/tclInt.h
+++ b/generic/tclInt.h
@@ -2441,6 +2441,9 @@ typedef struct List {
 				 * accomodate all elements. */
 } List;
 
+#define LIST_MAX \
+	(1 + (int)(((size_t)UINT_MAX - sizeof(List))/sizeof(Tcl_Obj *)))
+
 /*
  * Macro used to get the elements of a list object.
  */