diff --git a/ractor.c b/ractor.c
index 0c17d575ee..96c51eca70 100644
--- a/ractor.c
+++ b/ractor.c
@@ -2706,7 +2706,7 @@ obj_refer_only_shareables_p(VALUE obj)
 static int
 obj_traverse_replace_i(VALUE obj, struct obj_traverse_replace_data *data)
 {
-    VALUE replacement;
+    st_data_t replacement;
 
     if (RB_SPECIAL_CONST_P(obj)) {
         data->replacement = obj;
@@ -2719,14 +2719,14 @@ obj_traverse_replace_i(VALUE obj, struct obj_traverse_replace_data *data)
       case traverse_stop: return 1; // stop search
     }
 
-    replacement = data->replacement;
+    replacement = (st_data_t)data->replacement;
 
-    if (UNLIKELY(st_lookup(obj_traverse_replace_rec(data), (st_data_t)obj, (st_data_t *)&replacement))) {
-        data->replacement = replacement;
+    if (UNLIKELY(st_lookup(obj_traverse_replace_rec(data), (st_data_t)obj, &replacement))) {
+        data->replacement = (VALUE)replacement;
         return 0;
     }
     else {
-        st_insert(obj_traverse_replace_rec(data), (st_data_t)obj, (st_data_t)replacement);
+        st_insert(obj_traverse_replace_rec(data), (st_data_t)obj, replacement);
     }
 
     if (!data->move) {
@@ -2872,7 +2872,7 @@ obj_traverse_replace_i(VALUE obj, struct obj_traverse_replace_data *data)
         rb_bug("unreachable");
     }
 
-    data->replacement = replacement;
+    data->replacement = (VALUE)replacement;
 
     if (data->leave_func(obj, data) == traverse_stop) {
         return 1;
@@ -3052,9 +3052,9 @@ ractor_local_storage_mark(rb_ractor_t *r)
 
         for (int i=0; i<freed_ractor_local_keys.cnt; i++) {
             rb_ractor_local_key_t key = freed_ractor_local_keys.keys[i];
-            st_data_t val;
-            if (st_delete(r->local_storage, (st_data_t *)&key, &val) &&
-                key->type->free) {
+            st_data_t val, k = (st_data_t)key;
+            if (st_delete(r->local_storage, &k, &val) &&
+                (key = (rb_ractor_local_key_t)k)->type->free) {
                 (*key->type->free)((void *)val);
             }
         }
@@ -3179,9 +3179,9 @@ ractor_local_set(rb_ractor_local_key_t key, void *ptr)
 VALUE
 rb_ractor_local_storage_value(rb_ractor_local_key_t key)
 {
-    VALUE val;
-    if (ractor_local_ref(key, (void **)&val)) {
-        return val;
+    void *val;
+    if (ractor_local_ref(key, &val)) {
+        return (VALUE)val;
     }
     else {
         return Qnil;
diff --git a/vm_method.c b/vm_method.c
index 36a2c15e4b..c4b95f9391 100644
--- a/vm_method.c
+++ b/vm_method.c
@@ -1021,8 +1021,9 @@ rb_vm_lookup_overloaded_cme(const rb_callable_method_entry_t *cme)
 static void
 delete_overloaded_cme(const rb_callable_method_entry_t *cme)
 {
+    st_data_t cme_data = (st_data_t)cme;
     ASSERT_vm_locking();
-    st_delete(overloaded_cme_table(), (st_data_t *)&cme, NULL);
+    st_delete(overloaded_cme_table(), &cme_data, NULL);
 }
 
 static const rb_callable_method_entry_t *
diff --git a/win32/win32.c b/win32/win32.c
index c202e65e92..7f879b397f 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -855,7 +855,7 @@ socklist_lookup(SOCKET sock, int *flagp)
 
     thread_exclusive(socklist) {
 	if (!socklist) continue;
-	ret = st_lookup(socklist, (st_data_t)sock, (st_data_t *)&data);
+	ret = st_lookup(socklist, (st_data_t)sock, &data);
 	if (ret && flagp)
 	    *flagp = (int)data;
     }
diff --git a/yjit_codegen.c b/yjit_codegen.c
index aef5c0790d..cd46685b57 100644
--- a/yjit_codegen.c
+++ b/yjit_codegen.c
@@ -3212,9 +3212,9 @@ jit_thread_s_current(jitstate_t *jit, ctx_t *ctx, const struct rb_callinfo *ci,
 static method_codegen_t
 lookup_cfunc_codegen(const rb_method_definition_t *def)
 {
-    method_codegen_t gen_fn;
-    if (st_lookup(yjit_method_codegen_table, def->method_serial, (st_data_t *)&gen_fn)) {
-        return gen_fn;
+    st_data_t gen_fn;
+    if (st_lookup(yjit_method_codegen_table, def->method_serial, &gen_fn)) {
+        return (method_codegen_t)gen_fn;
     }
     return NULL;
 }