diff --git a/lib/bb/data.py b/lib/bb/data.py
index c0636e1..a68ab43 100644
--- a/lib/bb/data.py
+++ b/lib/bb/data.py
@@ -313,7 +313,7 @@ def build_dependencies(key, keys, shelldeps, vardepvals, d):
 def generate_dependencies(d):
 
     keys = set(key for key in d.keys() if not key.startswith("__"))
-    shelldeps = set(key for key in keys if d.getVarFlag(key, "export") and not d.getVarFlag(key, "unexport"))
+    shelldeps = set(key for key in keys if d.getVarFlag(key, "export") and not d.getVarFlag(key, "unexport") and not d.getVarFlag(key, "undep"))
     vardepvals = set(key for key in keys if d.getVarFlag(key, "vardepvalue"))
 
     deps = {}