diff --git a/plugins/ubuntu/apt_ubuntu b/plugins/ubuntu/apt_ubuntu
index 65907739..0dd66d6b 100755
--- a/plugins/ubuntu/apt_ubuntu
+++ b/plugins/ubuntu/apt_ubuntu
@@ -123,7 +123,7 @@ except ImportError:
 pkgs = {}
 total = 0
 for pkg in apt.Cache():
-    if pkg.isUpgradable:
+    if pkg.is_upgradable:
         a = check_origin(pkg)
         pkgs[a] = pkgs.get(a, 0) + 1
         total += 1