diff --git a/compat/strptime.c b/compat/strptime.c
index 38e9d03..0520a75 100644
--- a/compat/strptime.c
+++ b/compat/strptime.c
@@ -166,7 +166,7 @@
             for (i = 1; i <= min + range && isdigit(*s); i *= 10) {
                 *dest = *dest * 10 + *s++ - '0';
             }
-            if (*dest - min >= (unsigned)range) {
+            if (*dest - min >= range) {
                 return 0;
             }
             *dest -= adj;