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-rw-r--r--py/parse.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/py/parse.c b/py/parse.c
index c60bbb17e5..19975c71cd 100644
--- a/py/parse.c
+++ b/py/parse.c
@@ -316,7 +316,7 @@ STATIC void push_result_token(parser_t *parser) {
for (; i < len; i++) {
mp_uint_t dig;
int clower = str[i] | 0x20;
- if (unichar_isdigit(str[i]) && str[i] - '0' < base) {
+ if (unichar_isdigit(str[i]) && (mp_uint_t)(str[i] - '0') < base) {
dig = str[i] - '0';
} else if (base == 16 && 'a' <= clower && clower <= 'f') {
dig = clower - 'a' + 10;