diff --git a/slpkg/utilities.py b/slpkg/utilities.py
index c774503f..5fb5dc4f 100644
--- a/slpkg/utilities.py
+++ b/slpkg/utilities.py
@@ -19,7 +19,7 @@ class Utilities:
     def is_installed(self, name: str):
         """ Returns the installed package name. """
         for package in os.listdir(self.configs.log_packages):
-            pkg = '-'.join(package.split('-')[:-3])
+            pkg = self.split_installed_pkg(package)[0]
             if pkg == name and self.configs.sbo_repo_tag in package and pkg not in self.black.get():
                 return package