1 files changed, 1 insertions, 1 deletions
diff --git a/setup.py b/setup.py
index b848e2458..a57e65b56 100755
--- a/setup.py
+++ b/setup.py
@@ -392,7 +392,7 @@ def register_cython_module(module_name, dependencies=None):
 BUILD_EXTENSIONS = []
 
 register_cython_module("buildstream._yaml")
-register_cython_module("buildstream._variables")
+register_cython_module("buildstream._variables", dependencies=["buildstream._yaml"])
 
 #####################################################
 #             Main setup() Invocation               #