diff --git a/api/sixtyfps-cpp/include/sixtyfps.h b/api/sixtyfps-cpp/include/sixtyfps.h
index 0f06a01c4..6d49fbf61 100644
--- a/api/sixtyfps-cpp/include/sixtyfps.h
+++ b/api/sixtyfps-cpp/include/sixtyfps.h
@@ -215,7 +215,7 @@ using cbindgen_private::MouseEvent;
 using cbindgen_private::sixtyfps_visit_item_tree;
 namespace private_api {
 
-void dealloc(const ComponentVTable *, uint8_t *ptr, vtable::Layout layout)
+inline void dealloc(const ComponentVTable *, uint8_t *ptr, vtable::Layout layout)
 {
 #ifdef __cpp_sized_deallocation
     ::operator delete(reinterpret_cast<void *>(ptr), layout.size,
@@ -226,7 +226,7 @@ void dealloc(const ComponentVTable *, uint8_t *ptr, vtable::Layout layout)
 }
 
 template<typename T>
-vtable::Layout drop_in_place(ComponentRef component)
+inline vtable::Layout drop_in_place(ComponentRef component)
 {
     reinterpret_cast<T *>(component.instance)->~T();
     return vtable::Layout { sizeof(T), alignof(T) };
@@ -646,13 +646,13 @@ NativeStyleMetrics::NativeStyleMetrics()
 
 using cbindgen_private::StandardListViewItem;
 namespace cbindgen_private {
-bool operator==(const StandardListViewItem &a, const StandardListViewItem &b)
+inline bool operator==(const StandardListViewItem &a, const StandardListViewItem &b)
 {
     static_assert(sizeof(StandardListViewItem) == sizeof(std::tuple<SharedString>),
                   "must update to cover all fields");
     return a.text == b.text;
 }
-bool operator!=(const StandardListViewItem &a, const StandardListViewItem &b)
+inline bool operator!=(const StandardListViewItem &a, const StandardListViewItem &b)
 {
     return !(a == b);
 }
@@ -665,12 +665,12 @@ struct VersionCheckHelper
 };
 }
 
-void run_event_loop()
+inline void run_event_loop()
 {
     cbindgen_private::sixtyfps_run_event_loop();
 }
 
-void quit_event_loop()
+inline void quit_event_loop()
 {
     cbindgen_private::sixtyfps_quit_event_loop();
 }
@@ -678,7 +678,7 @@ void quit_event_loop()
 /// Registers a font by the specified path. The path must refer to an existing
 /// TrueType font font.
 /// \returns an empty optional on success, otherwise an error string
-std::optional<SharedString> register_font_from_path(const SharedString &path)
+inline std::optional<SharedString> register_font_from_path(const SharedString &path)
 {
     SharedString maybe_err;
     cbindgen_private::sixtyfps_register_font_from_path(&path, &maybe_err);
diff --git a/api/sixtyfps-cpp/include/sixtyfps_color.h b/api/sixtyfps-cpp/include/sixtyfps_color.h
index e32234605..7da0e04fb 100644
--- a/api/sixtyfps-cpp/include/sixtyfps_color.h
+++ b/api/sixtyfps-cpp/include/sixtyfps_color.h
@@ -182,7 +182,7 @@ inline Color Color::darker(float factor) const
 }
 
 template<>
-RgbaColor<uint8_t>::RgbaColor(const Color &color)
+inline RgbaColor<uint8_t>::RgbaColor(const Color &color)
 {
     red = color.red();
     green = color.green();
@@ -191,7 +191,7 @@ RgbaColor<uint8_t>::RgbaColor(const Color &color)
 }
 
 template<>
-RgbaColor<float>::RgbaColor(const Color &color)
+inline RgbaColor<float>::RgbaColor(const Color &color)
 {
     red = float(color.red()) / 255.;
     green = float(color.green()) / 255.;
@@ -210,8 +210,9 @@ RgbaColor<float> Color::to_argb_float() const
 }
 
 template<>
-void Property<Color>::set_animated_value(
-        const Color &new_value, const cbindgen_private::PropertyAnimation &animation_data) const
+inline void
+Property<Color>::set_animated_value(const Color &new_value,
+                                    const cbindgen_private::PropertyAnimation &animation_data) const
 {
     cbindgen_private::sixtyfps_property_set_animated_value_color(&inner, value, new_value,
                                                                  &animation_data);
diff --git a/api/sixtyfps-cpp/include/sixtyfps_properties.h b/api/sixtyfps-cpp/include/sixtyfps_properties.h
index 8e276e7a6..a716a4d2d 100644
--- a/api/sixtyfps-cpp/include/sixtyfps_properties.h
+++ b/api/sixtyfps-cpp/include/sixtyfps_properties.h
@@ -25,7 +25,7 @@ using cbindgen_private::StateInfo;
 
 namespace private_api {
 
-void sixtyfps_property_set_animated_binding_helper(
+inline void sixtyfps_property_set_animated_binding_helper(
         const cbindgen_private::PropertyHandleOpaque *handle, void (*binding)(void *, int32_t *),
         void *user_data, void (*drop_user_data)(void *),
         const cbindgen_private::PropertyAnimation *animation_data,
@@ -35,7 +35,7 @@ void sixtyfps_property_set_animated_binding_helper(
             handle, binding, user_data, drop_user_data, animation_data, transition_data);
 }
 
-void sixtyfps_property_set_animated_binding_helper(
+inline void sixtyfps_property_set_animated_binding_helper(
         const cbindgen_private::PropertyHandleOpaque *handle, void (*binding)(void *, float *),
         void *user_data, void (*drop_user_data)(void *),
         const cbindgen_private::PropertyAnimation *animation_data,
@@ -45,7 +45,7 @@ void sixtyfps_property_set_animated_binding_helper(
             handle, binding, user_data, drop_user_data, animation_data, transition_data);
 }
 
-void sixtyfps_property_set_animated_binding_helper(
+inline void sixtyfps_property_set_animated_binding_helper(
         const cbindgen_private::PropertyHandleOpaque *handle, void (*binding)(void *, Color *),
         void *user_data, void (*drop_user_data)(void *),
         const cbindgen_private::PropertyAnimation *animation_data,
@@ -55,7 +55,7 @@ void sixtyfps_property_set_animated_binding_helper(
             handle, binding, user_data, drop_user_data, animation_data, transition_data);
 }
 
-void sixtyfps_property_set_animated_binding_helper(
+inline void sixtyfps_property_set_animated_binding_helper(
         const cbindgen_private::PropertyHandleOpaque *handle, void (*binding)(void *, Brush *),
         void *user_data, void (*drop_user_data)(void *),
         const cbindgen_private::PropertyAnimation *animation_data,
@@ -198,7 +198,7 @@ private:
 };
 
 template<>
-void Property<int32_t>::set_animated_value(
+inline void Property<int32_t>::set_animated_value(
         const int32_t &new_value, const cbindgen_private::PropertyAnimation &animation_data) const
 {
     cbindgen_private::sixtyfps_property_set_animated_value_int(&inner, value, new_value,
@@ -206,8 +206,9 @@ void Property<int32_t>::set_animated_value(
 }
 
 template<>
-void Property<float>::set_animated_value(
-        const float &new_value, const cbindgen_private::PropertyAnimation &animation_data) const
+inline void
+Property<float>::set_animated_value(const float &new_value,
+                                    const cbindgen_private::PropertyAnimation &animation_data) const
 {
     cbindgen_private::sixtyfps_property_set_animated_value_float(&inner, value, new_value,
                                                                  &animation_data);
diff --git a/api/sixtyfps-cpp/include/sixtyfps_string.h b/api/sixtyfps-cpp/include/sixtyfps_string.h
index 26f37f14e..8a7cab004 100644
--- a/api/sixtyfps-cpp/include/sixtyfps_string.h
+++ b/api/sixtyfps-cpp/include/sixtyfps_string.h
@@ -176,7 +176,7 @@ private:
 };
 
 namespace private_api {
-cbindgen_private::Slice<uint8_t> string_to_slice(std::string_view str)
+inline cbindgen_private::Slice<uint8_t> string_to_slice(std::string_view str)
 {
     return cbindgen_private::Slice<uint8_t> {
         const_cast<unsigned char *>(reinterpret_cast<const unsigned char *>(str.data())), str.size()