diff --git a/lib/constants.js b/lib/constants.js
index 0935375..0334d1f 100644
--- a/lib/constants.js
+++ b/lib/constants.js
@@ -18,13 +18,6 @@ const COMPLETION_FILE_EXT = {
   zsh: 'zsh',
 };
 
-const TABTAB_FILE_NAME = {
-  bash: '__tabtab.bash',
-  fish: '__tabtab.fish',
-  pwsh: '__tabtab.ps1',
-  zsh: '__tabtab.zsh',
-};
-
 module.exports = {
   BASH_LOCATION,
   ZSH_LOCATION,
@@ -33,5 +26,4 @@ module.exports = {
   COMPLETION_DIR,
   SHELL_LOCATIONS,
   COMPLETION_FILE_EXT,
-  TABTAB_FILE_NAME,
 };
diff --git a/lib/filename.js b/lib/filename.js
index 1ce3507..91d18cc 100644
--- a/lib/filename.js
+++ b/lib/filename.js
@@ -1,4 +1,4 @@
-const { COMPLETION_FILE_EXT, TABTAB_FILE_NAME } = require('./constants');
+const { COMPLETION_FILE_EXT } = require('./constants');
 
 /**
  * Get a template file name for the SHELL provided.
@@ -33,11 +33,11 @@ const completionFileName = (name, shell = systemShell()) => {
  * @returns {String}
  */
 const tabtabFileName = (shell = systemShell()) => {
-  const filename = TABTAB_FILE_NAME[shell];
-  if (!filename) {
+  const ext = COMPLETION_FILE_EXT[shell];
+  if (!ext) {
     throw new Error(`Unsupported shell: ${shell}`);
   }
-  return filename;
+  return `__tabtab.${ext}`;
 };
 
 module.exports = {