diff --git a/misc/fish/completion.fish b/misc/fish/completion.fish
index c6b8ef16a..b7a272c61 100644
--- a/misc/fish/completion.fish
+++ b/misc/fish/completion.fish
@@ -14,7 +14,7 @@ function _nix_complete
   # But the variable also misses the current token so it cancels out.
   set -l nix_arg_to_complete (count $nix_args)
 
-  env NIX_GET_COMPLETIONS=$nix_arg_to_complete $nix_args $current_token
+  env NIX_GET_COMPLETIONS=$nix_arg_to_complete $nix_args $current_token 2>/dev/null
 end
 
 function _nix_accepts_files
diff --git a/src/libmain/loggers.cc b/src/libmain/loggers.cc
index 8c3c4e355..46438280a 100644
--- a/src/libmain/loggers.cc
+++ b/src/libmain/loggers.cc
@@ -7,7 +7,7 @@ namespace nix {
 LogFormat defaultLogFormat = LogFormat::raw;
 
 LogFormat parseLogFormat(const std::string & logFormatStr) {
-    if (logFormatStr == "raw" || getEnv("NIX_GET_COMPLETIONS"))
+    if (logFormatStr == "raw")
         return LogFormat::raw;
     else if (logFormatStr == "raw-with-logs")
         return LogFormat::rawWithLogs;