diff --git a/test/core/slice/b64_decode_corpus/testcase-5759629707444224 b/test/core/slice/b64_decode_corpus/testcase-5759629707444224
new file mode 100644
index 00000000000..b01bd95e5ca
--- /dev/null
+++ b/test/core/slice/b64_decode_corpus/testcase-5759629707444224
@@ -0,0 +1,6 @@
+=0þ5==0_
+
+
+==0_
+
+==0_==0_
\ No newline at end of file