diff --git a/core/my_basic.c b/core/my_basic.c
index 909fb45..2820a54 100755
--- a/core/my_basic.c
+++ b/core/my_basic.c
@@ -3720,15 +3720,15 @@ static int _calc_expression(mb_interpreter_t* s, _ls_node_t** l, _object_t** val
 	int result = 0;
 	_ls_node_t* ast = 0;
 	_running_context_t* running = 0;
-	register _ls_node_t* garbage = 0;
-	register _ls_node_t* optr = 0;
-	register _ls_node_t* opnd = 0;
-	register _object_t* c = 0;
-	register _object_t* x = 0;
-	register _object_t* a = 0;
-	register _object_t* b = 0;
-	register _object_t* r = 0;
-	register _object_t* theta = 0;
+	_ls_node_t* garbage = 0;
+	_ls_node_t* optr = 0;
+	_ls_node_t* opnd = 0;
+	_object_t* c = 0;
+	_object_t* x = 0;
+	_object_t* a = 0;
+	_object_t* b = 0;
+	_object_t* r = 0;
+	_object_t* theta = 0;
 	char pri = _ZERO_CHAR;
 	int* inep = 0;
 	int f = 0;