diff --git a/python/k4FWCore/ApplicationMgr.py b/python/k4FWCore/ApplicationMgr.py
index 59f965d5..e7bcd1f9 100644
--- a/python/k4FWCore/ApplicationMgr.py
+++ b/python/k4FWCore/ApplicationMgr.py
@@ -96,7 +96,7 @@ def _setup_reader(self, reader, iosvc_props):
                 logger.debug("Using the first frame to determine collections to read")
                 collections = list(frame.getAvailableCollections())
             except IndexError:
-                print("Warning, the events category wasn't found in the input file")
+                logger.warning("Warning, the events category wasn't found in the input file")
                 raise
             logger.info(f"Passing {collections} as collections to read to the Reader")
             reader.InputCollections = collections