diff --git a/prism_compile.c b/prism_compile.c
index 55bc348492eae3..8faacd66f65798 100644
--- a/prism_compile.c
+++ b/prism_compile.c
@@ -6862,6 +6862,8 @@ rb_translate_prism(pm_parser_t *parser, rb_iseq_t *iseq, pm_scope_node_t *scope_
     pm_compile_node(iseq, (pm_node_t *)scope_node, ret, scope_node->base.location.start, false, (pm_scope_node_t *)scope_node);
     iseq_set_sequence(iseq, ret);
 
+    st_free_table(index_lookup_table);
+
     return Qnil;
 }