diff --git a/src/config/session.c b/src/config/session.c
index ab472f19..9292e35c 100644
--- a/src/config/session.c
+++ b/src/config/session.c
@@ -23,6 +23,8 @@
 
 #if WLR_HAS_DRM_BACKEND
 	#include <wlr/backend/drm.h>
+#else
+	#define wlr_backend_is_drm(backend) (false)
 #endif
 
 static const char *const env_vars[] = {
@@ -181,7 +183,6 @@ env_dir_cleanup:
 	return success;
 }
 
-#if WLR_HAS_DRM_BACKEND
 static void
 backend_check_drm(struct wlr_backend *backend, void *is_drm)
 {
@@ -189,7 +190,6 @@ backend_check_drm(struct wlr_backend *backend, void *is_drm)
 		*(bool *)is_drm = true;
 	}
 }
-#endif
 
 static bool
 should_update_activation(struct server *server)
@@ -213,9 +213,7 @@ should_update_activation(struct server *server)
 
 	/* With no valid preference, update when a DRM backend is in use */
 	bool have_drm = false;
-#if WLR_HAS_DRM_BACKEND
 	wlr_multi_for_each_backend(server->backend, backend_check_drm, &have_drm);
-#endif
 	return have_drm;
 }