diff --git a/lib/utils/pyexec.c b/lib/utils/pyexec.c
index f96deb9e1ce11..718c6828cca12 100644
--- a/lib/utils/pyexec.c
+++ b/lib/utils/pyexec.c
@@ -90,6 +90,8 @@ STATIC int parse_compile_execute(const void *source, mp_parse_input_kind_t input
qstr source_name = lex->source_name;
mp_parse_tree_t parse_tree = mp_parse(lex, input_kind);
module_fun = mp_compile(&parse_tree, source_name, MP_EMIT_OPT_NONE, exec_flags & EXEC_FLAG_IS_REPL);
+ // Clear the parse tree because it has a heap pointer we don't need anymore.
+ *((uint32_t volatile*) &parse_tree.chunk) = 0;
#else
mp_raise_msg(&mp_type_RuntimeError, "script compilation not supported");
#endif
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