diff --git a/libshortfin/build_tools/python_lsan_suppressions.txt b/libshortfin/build_tools/python_lsan_suppressions.txt
index ed535c270..cc768d575 100644
--- a/libshortfin/build_tools/python_lsan_suppressions.txt
+++ b/libshortfin/build_tools/python_lsan_suppressions.txt
@@ -1 +1,2 @@
 leak:PyUnicode_New
+leak:_PyUnicodeWriter_Finish