diff --git a/Lib/email/_header_value_parser.py b/Lib/email/_header_value_parser.py
index 792072ab9f6128..94e6ebbb0dc983 100644
--- a/Lib/email/_header_value_parser.py
+++ b/Lib/email/_header_value_parser.py
@@ -2583,7 +2583,7 @@ def get_parameter(value):
             for t in token:
                 if t.token_type == 'extended-attrtext':
                     break
-            t.token_type == 'attrtext'
+            t.token_type = 'attrtext'
             appendto.append(t)
             param.charset = t.value
         if value[0] != "'":
diff --git a/Misc/NEWS.d/next/Library/2026-05-26-13-05-48.gh-issue-150474.rMA2ig.rst b/Misc/NEWS.d/next/Library/2026-05-26-13-05-48.gh-issue-150474.rMA2ig.rst
new file mode 100644
index 00000000000000..4327f288f1f029
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-05-26-13-05-48.gh-issue-150474.rMA2ig.rst
@@ -0,0 +1,2 @@
+Fixed an issue in :mod:`email` where an incorrect comparison in the header value parser :func:`get_parameter` could lead to improper parameter handling.
+Patch by Benedikt Johannes.