diff --git a/mseedpeek/mseedpeek.py b/mseedpeek/mseedpeek.py
index 06a7463d5495bbe4f3ef94da46d15d23cfd67f9d..5055be83e3d4e815a605be5850689d90d2e44c71 100644
--- a/mseedpeek/mseedpeek.py
+++ b/mseedpeek/mseedpeek.py
@@ -897,7 +897,8 @@ class MainWindow(QWidget):
                                             " integer number of block size (" +
                                             str(blksize) + ").")
                                     warn += " Header reading may not work."
-                                    warn += " To fix variable record length, use fixhdr."
+                                    warn += " To fix variable record length"
+                                    warn += ", use fixhdr."
                                     warn += f"\n\t File: {fullname}"
                                     print(warn)
                                     rw_error += 1