diff --git a/pisi/install.py b/pisi/install.py
index 15bb83f9..b4dc13cd 100644
--- a/pisi/install.py
+++ b/pisi/install.py
@@ -107,7 +107,7 @@ class Installer:
 
         # check conflicts
         for pkg in self.metadata.package.conflicts:
-            if installdb.has_package(self.pkginfo):
+            if installdb.is_installed(self.pkginfo):
                 raise InstallError("Package conflicts " + pkg)
     
         # check dependencies