diff --git a/include/proto/log.h b/include/proto/log.h
index a6c59ff..5d1215a 100644
--- a/include/proto/log.h
+++ b/include/proto/log.h
@@ -55,10 +55,10 @@
 int parse_logformat_var_args(char *args, struct logformat_node *node);
 
 /*
- * Parse a variable '%varname' or '%{args}varname' in logformat
+ * Parse a variable '%varname' or '%{args}varname' in log-format
  *
  */
-int parse_logformat_var(char *str, size_t len, struct proxy *curproxy, struct list *list_format, int *defoptions);
+int parse_logformat_var(char *arg, int arg_len, char *var, int var_len, struct proxy *curproxy, struct list *list_format, int *defoptions);
 
 /*
  * add to the logformat linked list