diff --git a/src/mstrap/supports/mise_installer.cr b/src/mstrap/supports/mise_installer.cr
index c5fe450..770c051 100644
--- a/src/mstrap/supports/mise_installer.cr
+++ b/src/mstrap/supports/mise_installer.cr
@@ -52,7 +52,7 @@ module MStrap
     end
 
     def installed?
-      File.exists?(MISE_INSTALL_PATH)
+      File.exists?(MISE_INSTALL_PATH) && (`command -v mise` && $?.success?)
     end
 
     private def fetch_installer!