diff --git a/include/pybind11/numpy.h b/include/pybind11/numpy.h
index 8551aa26485..1d8b415208b 100644
--- a/include/pybind11/numpy.h
+++ b/include/pybind11/numpy.h
@@ -208,7 +208,7 @@ struct npy_api {
         int len;
     };
 
-    static npy_api &get() {
+    static inline npy_api &get() {
         PYBIND11_CONSTINIT static gil_safe_call_once_and_store<npy_api> storage;
         return storage.call_once_and_store_result(lookup).get_stored();
     }
@@ -646,7 +646,7 @@ class dtype : public object {
     char flags() const { return detail::array_descriptor_proxy(m_ptr)->flags; }
 
 private:
-    static object &_dtype_from_pep3118() {
+    static inline object &_dtype_from_pep3118() {
         PYBIND11_CONSTINIT static gil_safe_call_once_and_store<object> storage;
         return storage
             .call_once_and_store_result([]() {
diff --git a/include/pybind11/options.h b/include/pybind11/options.h
index 1b2122522d5..bf9b66f0379 100644
--- a/include/pybind11/options.h
+++ b/include/pybind11/options.h
@@ -81,7 +81,7 @@ class options {
                                                   //  docstrings.
     };
 
-    static state &global_state() {
+    static inline state &global_state() {
         static state instance;
         return instance;
     }