1 files changed, 3 insertions, 2 deletions
diff --git a/stc/cfmt.h b/stc/cfmt.h
index 2b544051..6e4f4fcc 100644
--- a/stc/cfmt.h
+++ b/stc/cfmt.h
@@ -35,8 +35,9 @@ _cfmt_conv(int nargs, const char *fmt, ...);
 enum {_cfmt_bn=4, _cfmt_sn=64};
 STC_INLINE const char* _cfmt_strftime(char* n, char buf[][_cfmt_sn], size_t maxsize, const char *fmt, const struct tm *timeptr) {
     if (*n >= _cfmt_bn) return fmt;
-    strftime(buf[*n], maxsize, fmt, timeptr);
-    return buf[(*n)++];
+    int k = (*n)++;
+    strftime(buf[k], maxsize, fmt, timeptr);
+    return buf[k];
 }
 
 #ifndef __cplusplus