diff --git a/funcs/func_env.c b/funcs/func_env.c
index 16f9a7445c8527aa180929966d19ad7f200c63fc..1d3e95c0ef1bafe6eb63ee93a176499285db2328 100644
--- a/funcs/func_env.c
+++ b/funcs/func_env.c
@@ -699,7 +699,7 @@ static int file_read(struct ast_channel *chan, const char *cmd, char *data, stru
 			if (fread(fbuf, 1, i + sizeof(fbuf) > flength ? flength - i : sizeof(fbuf), ff) < (i + sizeof(fbuf) > flength ? flength - i : sizeof(fbuf))) {
 				ast_log(LOG_ERROR, "Short read?!!\n");
 			}
-			ast_debug(3, "Appending first %" PRId64" bytes of fbuf=%s\n", (long)(i + sizeof(fbuf) > length_offset ? length_offset - i : sizeof(fbuf)), fbuf);
+			ast_debug(3, "Appending first %" PRId64" bytes of fbuf=%s\n", (int64_t)(i + sizeof(fbuf) > length_offset ? length_offset - i : sizeof(fbuf)), fbuf);
 			ast_str_append_substr(buf, len, fbuf, i + sizeof(fbuf) > length_offset ? length_offset - i : sizeof(fbuf));
 		}
 	} else if (length == 0) {