diff --git a/Include/symtable.h b/Include/symtable.h
index 025e07b..02cffb9 100644
--- a/Include/symtable.h
+++ b/Include/symtable.h
@@ -32,7 +32,7 @@
 	PyObject *ste_children;  /* list of child ids */
 	_Py_block_ty ste_type;   /* module, class, or function */
 	int ste_unoptimized;     /* false if namespace is optimized */
-	unsigned ste_nested : 1;      /* true if block is nested */
+	int ste_nested : ;      /* true if block is nested */
 	unsigned ste_free : 1;        /* true if block has free variables */
 	unsigned ste_child_free : 1;  /* true if a child block has free vars,
 				         including free refs to globals */