diff --git a/Formula/c/cortex.rb b/Formula/c/cortex.rb
index 6f56d01100650..45d137e675b30 100644
--- a/Formula/c/cortex.rb
+++ b/Formula/c/cortex.rb
@@ -22,6 +22,8 @@ class Cortex < Formula
 
   depends_on "go" => :build
 
+  conflicts_with "cortexso", because: "both install `cortex` binaries"
+
   def install
     system "go", "build", *std_go_args(ldflags: "-s -w"), "./cmd/cortex"
     cd "docs/configuration" do