diff --git a/easybuild/tools/filetools.py b/easybuild/tools/filetools.py
index 8848edcc89..17a13b75a5 100644
--- a/easybuild/tools/filetools.py
+++ b/easybuild/tools/filetools.py
@@ -484,7 +484,7 @@ def extract_file(fn, dest, cmd=None, extra_options=None, overwrite=False, forced
     return base_dir
 
 
-def which(cmd, retain_all=False, check_perms=True, log_ok=True, log_error=None, on_error=None):
+def which(cmd, retain_all=False, check_perms=True, log_ok=True, on_error=WARN):
     """
     Return (first) path in $PATH for specified command, or None if command is not found
 
@@ -493,17 +493,6 @@ def which(cmd, retain_all=False, check_perms=True, log_ok=True, log_error=None,
     :param log_ok: Log an info message where the command has been found (if any)
     :param on_error: What to do if the command was not found, default: WARN. Possible values: IGNORE, WARN, ERROR
     """
-    if log_error is not None:
-        _log.deprecated("'log_error' named argument in which function has been replaced by 'on_error'", '5.0')
-        # If set, make sure on_error is at least WARN
-        if log_error and on_error == IGNORE:
-            on_error = WARN
-        elif not log_error and on_error is None:  # If set to False, use IGNORE unless on_error is also set
-            on_error = IGNORE
-    # Set default
-    # TODO: After removal of log_error from the parameters, on_error=WARN can be used instead of this
-    if on_error is None:
-        on_error = WARN
     if on_error not in (IGNORE, WARN, ERROR):
         raise EasyBuildError("Invalid value for 'on_error': %s", on_error)