diff --git a/wobbl_tools/text/log.py b/wobbl_tools/text/log.py
index f7e50e7..c04d872 100644
--- a/wobbl_tools/text/log.py
+++ b/wobbl_tools/text/log.py
@@ -70,7 +70,7 @@ class Log:
 
         self.write(msg, "info", prefix)
 
-    def ok(self, msg: str, prefix: str):
+    def ok(self, msg: str, prefix: str=""):
         """
         Shortcut for Log.write(msg, "ok", prefix)
 
@@ -80,7 +80,7 @@ class Log:
 
         self.write(msg, "ok", prefix)
 
-    def warning(self, msg: str, prefix: str):
+    def warning(self, msg: str, prefix: str=""):
         """
         Shortcut for Log.write(msg, "warning", prefix)
 
@@ -90,7 +90,7 @@ class Log:
 
         self.write(msg, "warning", prefix)
 
-    def error(self, msg: str, prefix: str):
+    def error(self, msg: str, prefix: str=""):
         """
         Shortcut for Log.write(msg, "error", prefix)