diff --git a/setup.cfg b/setup.cfg
index e71ad53..5b0bd98 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -3,7 +3,7 @@
 
 [metadata]
 name = de.p1st.monitor
-version = 0.11.4
+version = 0.11.5
 author = Daniel Langbein
 author_email = daniel@systemli.org
 description = periodically monitor and warn
diff --git a/src/de/p1st/monitor/print_util.py b/src/de/p1st/monitor/print_util.py
index 4cc6677..ddec96b 100644
--- a/src/de/p1st/monitor/print_util.py
+++ b/src/de/p1st/monitor/print_util.py
@@ -15,32 +15,38 @@ import sys
 # define SD_DEBUG   "<7>"  /* debug-level messages */
 
 def print_emerg(message: object):
-    print(f'<0> {message}', file=sys.stderr)
+    do_print('<0> ', message, file=sys.stderr)
 
 
 def print_alert(message: object):
-    print(f'<1> {message}', file=sys.stderr)
+    do_print('<1> ', message, file=sys.stderr)
 
 
 def print_crit(message: object):
-    print(f'<2> {message}', file=sys.stderr)
+    do_print('<2> ', message, file=sys.stderr)
 
 
 def print_err(message: object):
-    print(f'<3> {message}', file=sys.stderr)
+    do_print('<3> ', message, file=sys.stderr)
 
 
 def print_warning(message: object):
-    print(f'<4> {message}', file=sys.stderr)
+    do_print('<4> ', message, file=sys.stderr)
 
 
 def print_notice(message: object):
-    print(f'<5> {message}', file=sys.stdout)
+    do_print('<5> ', message)
 
 
 def print_info(message: object):
-    print(f'<6> {message}', file=sys.stdout)
+    do_print('<6> ', message)
 
 
 def print_debug(message: object):
-    print(f'<7> {message}', file=sys.stdout)
+    do_print('<7> ', message)
+
+
+def do_print(line_prefix: str, message: object, file=sys.stdout) -> None:
+    # Prefix each line in str(object) with `line_prefix`.
+    prefixed = line_prefix + str(message).replace('\n', '\n' + line_prefix)
+    print(prefixed, file=file)