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-rw-r--r--src/buildstream/element.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/buildstream/element.py b/src/buildstream/element.py
index 6a0fa5fab..d15263000 100644
--- a/src/buildstream/element.py
+++ b/src/buildstream/element.py
@@ -285,6 +285,8 @@ class Element(Plugin):
variables = self.__extract_variables(project, meta)
variables["element-name"] = self.name
self.__variables = Variables(variables)
+ if not meta.is_junction:
+ self.__variables.check()
# Collect the composited environment now that we have variables
unexpanded_env = self.__extract_environment(project, meta)