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-rw-r--r--buildstream/_project.py8
1 files changed, 6 insertions, 2 deletions
diff --git a/buildstream/_project.py b/buildstream/_project.py
index b568cf852..0273f2cc3 100644
--- a/buildstream/_project.py
+++ b/buildstream/_project.py
@@ -164,8 +164,12 @@ class Project():
if self._cache_key is None:
# Anything that alters the build goes into the unique key
- # (currently nothing here)
- self._cache_key = _cachekey.generate_key({})
+ cache_key_dict = {}
+
+ if self.fail_on_overlap:
+ cache_key_dict['fail-on-overlap'] = True
+
+ self._cache_key = _cachekey.generate_key(cache_key_dict)
return self._cache_key