diff --git a/src/main.c b/src/main.c
index 862a9460b0cb128bbbee10dc900daa243ad3b23a..d53a8628d858e7d6bc5107d86b7da0ff35844def 100644
--- a/src/main.c
+++ b/src/main.c
@@ -2059,7 +2059,7 @@ static ParameterError getparameter(char *flag, /* f or -long-flag */
            */
           char *p = strchr(nextarg, '=');
           long size = 0;
-          int nlen;
+          size_t nlen;
           char is_file;
           if(!p)
             p = strchr(nextarg, '@');