diff --git a/core/my_basic.c b/core/my_basic.c
index 2dcde7f..7e4d549 100755
--- a/core/my_basic.c
+++ b/core/my_basic.c
@@ -3079,7 +3079,6 @@ bool_t _is_accessor(char c) {
 
 bool_t _is_exponent_prefix(char* s, int begin, int end) {
 	/* Determine whether current symbol is an exponent prefix */
-	_parsing_context_t* context = 0;
 	int i = 0;
 
 	mb_assert(s);