diff --git a/backend/backend.c b/backend/backend.c
index 9a3d81d88..3fb74c578 100644
--- a/backend/backend.c
+++ b/backend/backend.c
@@ -4,9 +4,9 @@
 #include <string.h>
 #include <errno.h>
 #include <wlr/session.h>
+#include <wlr/backend/interface.h>
 #include "common/log.h"
 #include "backend/drm/backend.h"
-#include "backend.h"
 
 struct wlr_backend *wlr_backend_create(const struct wlr_backend_impl *impl,
 		struct wlr_backend_state *state) {
diff --git a/backend/drm/backend.c b/backend/drm/backend.c
index 2840f17f3..7c2ff7feb 100644
--- a/backend/drm/backend.c
+++ b/backend/drm/backend.c
@@ -10,7 +10,7 @@
 #include <wlr/session.h>
 #include <wlr/types.h>
 #include <wlr/common/list.h>
-#include "backend.h"
+#include <wlr/backend/interface.h>
 #include "backend/udev.h"
 #include "backend/drm/backend.h"
 #include "backend/drm/drm.h"
diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index 27a5932f0..2523eaf09 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -12,12 +12,11 @@
 #include <gbm.h>
 #include <GLES3/gl3.h>
 #include <wayland-server.h>
-
-#include "types.h"
-#include "backend.h"
+#include <wlr/backend/interface.h>
 #include "backend/drm/backend.h"
 #include "backend/drm/drm.h"
 #include "common/log.h"
+#include "types.h"
 
 static const char *conn_name[] = {
 	[DRM_MODE_CONNECTOR_Unknown]     = "Unknown",
diff --git a/backend/udev.c b/backend/udev.c
index fb2133394..c84b8e319 100644
--- a/backend/udev.c
+++ b/backend/udev.c
@@ -9,8 +9,6 @@
 #include <xf86drmMode.h>
 #include <wayland-server.h>
 #include <wlr/session.h>
-#include "backend.h"
-#include "backend/drm/backend.h"
 #include "backend/udev.h"
 #include "common/log.h"
 
diff --git a/include/backend.h b/include/wlr/backend/interface.h
similarity index 83%
rename from include/backend.h
rename to include/wlr/backend/interface.h
index d42c6f17c..15cfb6c37 100644
--- a/include/backend.h
+++ b/include/wlr/backend/interface.h
@@ -1,5 +1,5 @@
-#ifndef _WLR_BACKEND_INTERNAL_H
-#define _WLR_BACKEND_INTERNAL_H
+#ifndef _WLR_BACKEND_INTERFACE_H
+#define _WLR_BACKEND_INTERFACE_H
 
 #include <stdbool.h>
 #include <wlr/backend.h>
diff --git a/include/wlr/session.h b/include/wlr/session.h
index 5f210f101..bd5a96c05 100644
--- a/include/wlr/session.h
+++ b/include/wlr/session.h
@@ -4,7 +4,7 @@
 #include <wayland-server.h>
 #include <sys/types.h>
 
-struct session_interface;
+struct session_impl;
 
 // Passed to the listeners of device_paused/resumed
 struct device_arg {
@@ -13,7 +13,7 @@ struct device_arg {
 };
 
 struct wlr_session {
-	const struct session_interface *iface;
+	const struct session_impl *impl;
 
 	struct wl_signal device_paused;
 	struct wl_signal device_resumed;
diff --git a/include/session/interface.h b/include/wlr/session/interface.h
similarity index 72%
rename from include/session/interface.h
rename to include/wlr/session/interface.h
index 7345c4cf6..78256dd6b 100644
--- a/include/session/interface.h
+++ b/include/wlr/session/interface.h
@@ -3,7 +3,7 @@
 
 #include <wlr/session.h>
 
-struct session_interface {
+struct session_impl {
 	struct wlr_session *(*start)(struct wl_display *disp);
 	void (*finish)(struct wlr_session *session);
 	int (*open)(struct wlr_session *restrict session,
@@ -12,7 +12,4 @@ struct session_interface {
 	bool (*change_vt)(struct wlr_session *session, int vt);
 };
 
-extern const struct session_interface session_logind_iface;
-extern const struct session_interface session_direct_iface;
-
 #endif
diff --git a/session/direct.c b/session/direct.c
index c135070fb..c735dae4a 100644
--- a/session/direct.c
+++ b/session/direct.c
@@ -1,5 +1,4 @@
 #define _POSIX_C_SOURCE 200809L
-
 #include <errno.h>
 #include <stdlib.h>
 #include <stdbool.h>
@@ -7,10 +6,11 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <wayland-server.h>
-
-#include "session/interface.h"
+#include <wlr/session/interface.h>
 #include "common/log.h"
 
+const struct session_impl session_direct;
+
 struct direct_session {
 	struct wlr_session base;
 };
@@ -44,13 +44,13 @@ static struct wlr_session *direct_session_start(struct wl_display *disp) {
 
 	wlr_log(L_INFO, "Successfully loaded direct session");
 
-	session->base.iface = &session_direct_iface;
+	session->base.impl = &session_direct;
 	wl_signal_init(&session->base.device_paused);
 	wl_signal_init(&session->base.device_resumed);
 	return &session->base;
 }
 
-const struct session_interface session_direct_iface = {
+const struct session_impl session_direct = {
 	.start = direct_session_start,
 	.finish = direct_session_finish,
 	.open = direct_session_open,
diff --git a/session/logind.c b/session/logind.c
index 6f0327e62..6ce7e4c22 100644
--- a/session/logind.c
+++ b/session/logind.c
@@ -1,5 +1,4 @@
 #define _POSIX_C_SOURCE 200809L
-
 #include <stdio.h>
 #include <stdbool.h>
 #include <stdlib.h>
@@ -12,10 +11,11 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <wayland-server.h>
-
-#include "session/interface.h"
+#include <wlr/session/interface.h>
 #include "common/log.h"
 
+const struct session_impl session_logind;
+
 struct logind_session {
 	struct wlr_session base;
 
@@ -335,7 +335,7 @@ static struct wlr_session *logind_session_start(struct wl_display *disp) {
 
 	wlr_log(L_INFO, "Successfully loaded logind session");
 
-	session->base.iface = &session_logind_iface;
+	session->base.impl = &session_logind;
 	wl_signal_init(&session->base.device_paused);
 	wl_signal_init(&session->base.device_resumed);
 	return &session->base;
@@ -350,7 +350,7 @@ error:
 	return NULL;
 }
 
-const struct session_interface session_logind_iface = {
+const struct session_impl session_logind = {
 	.start = logind_session_start,
 	.finish = logind_session_finish,
 	.open = logind_take_device,
diff --git a/session/session.c b/session/session.c
index 5df9fbd4c..dbdd8156a 100644
--- a/session/session.c
+++ b/session/session.c
@@ -1,22 +1,24 @@
 #include <stddef.h>
-
-#include <wlr/session.h>
 #include <stdarg.h>
+#include <wlr/session.h>
+#include <wlr/session/interface.h>
 #include "common/log.h"
-#include "session/interface.h"
 
-static const struct session_interface *ifaces[] = {
+extern const struct session_impl session_logind;
+extern const struct session_impl session_direct;
+
+static const struct session_impl *impls[] = {
 #ifdef HAS_SYSTEMD
-	&session_logind_iface,
+	&session_logind,
 #endif
-	&session_direct_iface,
+	&session_direct,
 	NULL,
 };
 
 struct wlr_session *wlr_session_start(struct wl_display *disp) {
-	const struct session_interface **iter;
+	const struct session_impl **iter;
 
-	for (iter = ifaces; *iter; ++iter) {
+	for (iter = impls; *iter; ++iter) {
 		struct wlr_session *session = (*iter)->start(disp);
 		if (session) {
 			return session;
@@ -28,19 +30,19 @@ struct wlr_session *wlr_session_start(struct wl_display *disp) {
 }
 
 void wlr_session_finish(struct wlr_session *session) {
-	session->iface->finish(session);
+	session->impl->finish(session);
 };
 
 int wlr_session_open_file(struct wlr_session *restrict session,
 	const char *restrict path) {
 
-	return session->iface->open(session, path);
+	return session->impl->open(session, path);
 }
 
 void wlr_session_close_file(struct wlr_session *session, int fd) {
-	session->iface->close(session, fd);
+	session->impl->close(session, fd);
 }
 
 bool wlr_session_change_vt(struct wlr_session *session, int vt) {
-	return session->iface->change_vt(session, vt);
+	return session->impl->change_vt(session, vt);
 }