diff --git a/compile.c b/compile.c
index 4b36e4ebd1..df258da772 100644
--- a/compile.c
+++ b/compile.c
@@ -984,7 +984,7 @@ rb_iseq_compile_prism_node(rb_iseq_t * iseq, pm_scope_node_t *scope_node, pm_par
         constants[index] = rb_intern3((const char *) constant->start, constant->length, encoding);
     }
 
-    scope_node->constants = (void *)constants;
+    scope_node->constants = constants;
 
     CHECK(rb_translate_prism(iseq, scope_node, ret));
     free(constants);
diff --git a/prism_compile.c b/prism_compile.c
index 4d54ea34ad..e8e9890f13 100644
--- a/prism_compile.c
+++ b/prism_compile.c
@@ -2467,7 +2467,7 @@ pm_compile_node(rb_iseq_t *iseq, const pm_node_t *node, LINK_ANCHOR *const ret,
             st_insert(index_lookup_table, constant_id, i);
         }
 
-        scope_node->index_lookup_table = (void *)index_lookup_table;
+        scope_node->index_lookup_table = index_lookup_table;
 
         ISEQ_BODY(iseq)->param.lead_num = (int)requireds_list.size;
         ISEQ_BODY(iseq)->param.opt_num = (int)optionals_list.size;
diff --git a/prism_compile.h b/prism_compile.h
index dcafa85555..d307807b84 100644
--- a/prism_compile.h
+++ b/prism_compile.h
@@ -11,10 +11,8 @@ typedef struct pm_scope_node {
     pm_constant_id_list_t locals;
     pm_parser_t *parser;
 
-    // We don't have the CRuby types ID and st_table within Prism
-    // so we use void *
-    void *constants; // ID *constants
-    void *index_lookup_table; // st_table *index_lookup_table
+    ID *constants;
+    st_table *index_lookup_table;
 } pm_scope_node_t;
 
 void pm_scope_node_init(const pm_node_t *node, pm_scope_node_t *scope, pm_scope_node_t *previous, pm_parser_t *parser);