diff --git a/lib/ansible/module_utils/common/parameters.py b/lib/ansible/module_utils/common/parameters.py
index 8bba4d5f32c..60453d5d93a 100644
--- a/lib/ansible/module_utils/common/parameters.py
+++ b/lib/ansible/module_utils/common/parameters.py
@@ -661,17 +661,13 @@ def _validate_argument_values(argument_spec, parameters, options_context=None, e
                 elif parameters[param] not in choices:
                     # PyYaml converts certain strings to bools. If we can unambiguously convert back, do so before checking
                     # the value. If we can't figure this out, module author is responsible.
-                    lowered_choices = None
                     if parameters[param] == 'False':
-                        lowered_choices = lenient_lowercase(choices)
                         overlap = BOOLEANS_FALSE.intersection(choices)
                         if len(overlap) == 1:
                             # Extract from a set
                             (parameters[param],) = overlap
 
                     if parameters[param] == 'True':
-                        if lowered_choices is None:
-                            lowered_choices = lenient_lowercase(choices)
                         overlap = BOOLEANS_TRUE.intersection(choices)
                         if len(overlap) == 1:
                             (parameters[param],) = overlap