diff --git a/src/fish.cpp b/src/fish.cpp
index ceb49c053..fc798bf4a 100644
--- a/src/fish.cpp
+++ b/src/fish.cpp
@@ -383,7 +383,7 @@ int main(int argc, char **argv) {
 
     parser_t &parser = parser_t::principal_parser();
 
-    const io_chain_t empty_ios;
+    const io_chain_t empty_ios {};
     if (read_init(paths)) {
         // Stomp the exit status of any initialization commands (issue #635).
         proc_set_last_status(STATUS_CMD_OK);