diff --git a/pkgs/development/tools/go-task/default.nix b/pkgs/development/tools/go-task/default.nix
index 3bbb466eaae4..8c456874899b 100644
--- a/pkgs/development/tools/go-task/default.nix
+++ b/pkgs/development/tools/go-task/default.nix
@@ -48,11 +48,11 @@ buildGoModule rec {
     installShellCompletion completion/{bash,fish,zsh}/*
 
     substituteInPlace $out/share/bash-completion/completions/task.bash \
-      --replace-warn 'complete -F _task task' 'complete -F _task task go-task'
+      --replace-fail 'complete -F _task task' 'complete -F _task task go-task'
     substituteInPlace $out/share/fish/vendor_completions.d/task.fish \
-      --replace-warn 'complete -c $GO_TASK_PROGNAME' 'complete -c $GO_TASK_PROGNAME -c go-task'
+      --replace-fail 'complete -c $GO_TASK_PROGNAME' 'complete -c $GO_TASK_PROGNAME -c go-task'
     substituteInPlace $out/share/zsh/site-functions/_task \
-      --replace-warn '#compdef task' '#compdef task go-task'
+      --replace-fail '#compdef task' '#compdef task go-task'
   '';
 
   passthru.tests = {