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-rw-r--r--buildstream/_options/optionpool.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/buildstream/_options/optionpool.py b/buildstream/_options/optionpool.py
index 387080110..90a404bfb 100644
--- a/buildstream/_options/optionpool.py
+++ b/buildstream/_options/optionpool.py
@@ -138,7 +138,7 @@ class OptionPool():
# Variables must be resolved at this point.
#
try:
- template_string = "{%% if %s %%} True {%% else %%} False {%% endif %%}" % expression
+ template_string = "{{% if {} %}} True {{% else %}} False {{% endif %}}".format(expression)
template = self.environment.from_string(template_string)
context = template.new_context(self.variables, shared=True)
result = template.root_render_func(context)