diff --git a/django/db/backends/postgresql/operations.py b/django/db/backends/postgresql/operations.py
index ab451ac63f..ec162d53f4 100644
--- a/django/db/backends/postgresql/operations.py
+++ b/django/db/backends/postgresql/operations.py
@@ -320,7 +320,7 @@ class DatabaseOperations(BaseDatabaseOperations):
             for valid_option in self.explain_options:
                 value = options.pop(valid_option, None)
                 if value is not None:
-                    extra[valid_option.upper()] = value
+                    extra[valid_option] = value
         prefix = super().explain_query_prefix(format, **options)
         if format:
             extra["FORMAT"] = format