diff --git a/Library/Homebrew/abstract_command.rb b/Library/Homebrew/abstract_command.rb
index 46c4e2b0e2..7bdc7b3907 100644
--- a/Library/Homebrew/abstract_command.rb
+++ b/Library/Homebrew/abstract_command.rb
@@ -32,12 +32,6 @@ module Homebrew
              .delete_suffix("-cmd")
       end
 
-      sig { void }
-      def raise_sh_command_error!
-        raise StandardError, "This command is just here for completions generation. " \
-                             "It's actually defined in `cmd/#{command_name}` instead."
-      end
-
       # @return the AbstractCommand subclass associated with the brew CLI command name.
       sig { params(name: String).returns(T.nilable(T.class_of(AbstractCommand))) }
       def command(name) = subclasses.find { _1.command_name == name }
@@ -67,5 +61,12 @@ module Homebrew
 
     sig { abstract.void }
     def run; end
+
+    sig { void }
+    def raise_sh_command_error!
+      raise StandardError,
+            "This command is just here for completions generation. " \
+            "It's actually defined in `cmd/#{self.class.command_name}.sh` instead."
+    end
   end
 end