diff --git a/client/util.h b/client/util.h
index 4b670b16a..965262410 100644
--- a/client/util.h
+++ b/client/util.h
@@ -174,7 +174,7 @@ extern void AddLogLine(char *fileName, char *extData, char *c);
 extern void AddLogHex(char *fileName, char *extData, const uint8_t * data, const size_t len);
 extern void AddLogUint64(char *fileName, char *extData, const uint64_t data);
 extern void AddLogCurrentDT(char *fileName);
-extern void FillFileNameByUID(char *fileName, uint8_t * uid, const char *ext, int uidlen);
+extern void FillFileNameByUID(char *filenamePrefix, uint8_t * uid, const char *ext, int uidlen);
 
 extern void hex_to_buffer(const uint8_t *buf, const uint8_t *hex_data, const size_t hex_len, 
 						  const size_t hex_max_len, const size_t min_str_len, const size_t spaces_between,