diff --git a/steam-runtime-tools/graphics-internal.h b/steam-runtime-tools/graphics-internal.h
index 0bcaf05023652fe45c3b6d341096912d1ebb17f0..db454e7e406bea64caa71eb5fe22187cfcea38ee 100644
--- a/steam-runtime-tools/graphics-internal.h
+++ b/steam-runtime-tools/graphics-internal.h
@@ -128,7 +128,9 @@ _srt_graphics_rendering_interface_string (SrtRenderingInterface rendering_interf
 
 #endif
 
+G_GNUC_INTERNAL
 GList *_srt_load_egl_icds (gchar **envp,
                            const char * const *multiarch_tuples);
+G_GNUC_INTERNAL
 GList *_srt_load_vulkan_icds (gchar **envp,
                               const char * const *multiarch_tuples);