diff --git a/monitoring/db/scripts/get_detailed_power.py b/monitoring/db/scripts/get_detailed_power.py
index adbc90d..12387d6 100644
--- a/monitoring/db/scripts/get_detailed_power.py
+++ b/monitoring/db/scripts/get_detailed_power.py
@@ -79,7 +79,7 @@ class Power:
 				f.write(self.header())
 				f.write(self.body())
 		except IOError:
-			print("Error: could not write to file ", filename)
+			print("Error: could not write to file ", fname)
 			fname = None
 
 		return fname