diff --git a/include/pybind11/numpy.h b/include/pybind11/numpy.h
index 09894cf74f..bd4d98eab3 100644
--- a/include/pybind11/numpy.h
+++ b/include/pybind11/numpy.h
@@ -267,7 +267,7 @@ 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();
     }
@@ -761,7 +761,7 @@ class dtype : public object {
 #endif
 
 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 1b2122522d..bf9b66f037 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;
     }