diff --git a/slpkg/utilities.py b/slpkg/utilities.py
index 60295627..ec409286 100644
--- a/slpkg/utilities.py
+++ b/slpkg/utilities.py
@@ -33,14 +33,14 @@ class Utilities:
         self.bred: str = f'{self.bold}{self.red}'
 
         self.installed_packages: list = list(self.all_installed())
+        self.installed_package_names: list = list(self.all_installed_names())
 
     def is_package_installed(self, name: str) -> str:
         """ Returns the installed package name. """
-        for package in self.installed_packages:
-            pkg: str = self.split_binary_pkg(package)[0]
+        for package_name in self.installed_package_names:
 
-            if pkg == name:
-                return package
+            if package_name == name:
+                return package_name
 
         return ''
 
@@ -127,8 +127,8 @@ class Utilities:
         if installed:
             installed_version: str = self.split_binary_pkg(installed)[1]
 
-        return (str(LooseVersion(repository_version + repo_build_tag)) >
-                str(LooseVersion(installed_version + inst_build_tag)))
+        return (str(LooseVersion(f'{repository_version}.{repo_build_tag}')) >
+                str(LooseVersion(f'{repository_version}.{repo_build_tag}')))
 
     def read_build_tag(self, sbo: str) -> str:
         """ Patching SBo TAG from the configuration file. """