diff --git a/src/pystog/stog.py b/src/pystog/stog.py
index 07c8ccf..6670476 100644
--- a/src/pystog/stog.py
+++ b/src/pystog/stog.py
@@ -1216,7 +1216,7 @@ def fourier_filter(self):
 
         # Get reciprocal and real space data
         if self.gr_title not in self.gr_master:
-            msg = "WARNING: Fourier filtered before initial transform. " "Performing now..."
+            msg = "WARNING: Fourier filtered before initial transform. Performing now..."
             print(msg)
             self.transform_merged()