diff --git a/src/shell-init.ts b/src/shell-init.ts
index 29ad0f5..6ddd6f0 100644
--- a/src/shell-init.ts
+++ b/src/shell-init.ts
@@ -40,7 +40,12 @@ const removeMambaInitBlockFromBashProfile = () => {
 const copyMambaBatToMicromambaBat = (options: Options) => {
   const mambaBat = path.join(options.micromambaRootPath, 'condabin', 'mamba.bat')
   const micromambaBat = path.join(options.micromambaRootPath, 'condabin', 'micromamba.bat')
-  return fs.copyFile(mambaBat, micromambaBat)
+  if (existsSync(mambaBat)) {
+    return fs.copyFile(mambaBat, micromambaBat)
+  }
+  else {
+    return Promise.resolve(undefined)
+  }
 }
 
 export const shellInit = (options: Options, shell: string) => {