diff --git a/power-sequencer/gen-ucd90160-defs.py b/power-sequencer/gen-ucd90160-defs.py
index 66bbb9b..1cc2274 100755
--- a/power-sequencer/gen-ucd90160-defs.py
+++ b/power-sequencer/gen-ucd90160-defs.py
@@ -44,7 +44,7 @@
     output_file = os.path.join(args.output_dir, "ucd90160_defs.cpp")
 
     mylookup = TemplateLookup(directories=templates_dir.split())
-    mytemplate = mylookup.get_template("ucd90160_defs.mako.cpp")
+    mytemplate = mylookup.get_template("ucd90160_defs.cpp.mako")
 
     with open(output_file, "w") as output:
         output.write(mytemplate.render(ucd90160s=ucd90160_data))