diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 742b476d..71ac53e6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -60,8 +60,7 @@ jobs:
         - "3.10"
         - "3.11"
         - "3.12"
-        # TODO: Enable this once fixed https://github.com/jcrist/msgspec/issues/910
-        # - "3.13"
+        - "3.13"
         - "3.14"
 
     steps:
diff --git a/src/msgspec/_core.c b/src/msgspec/_core.c
index d4151cd8..32834d41 100644
--- a/src/msgspec/_core.c
+++ b/src/msgspec/_core.c
@@ -5328,6 +5328,10 @@ Struct_alloc(PyTypeObject *type) {
     PyObject *obj;
     bool is_gc = MS_TYPE_IS_GC(type);
 
+#if PY313_PLUS && !PY314_PLUS
+    type->tp_flags &= ~Py_TPFLAGS_INLINE_VALUES;
+#endif
+
     if (is_gc) {
         obj = PyObject_GC_New(PyObject, type);
     }