diff --git a/spice/controller_prot.h b/spice/controller_prot.h
index 0b0316f..9216e38 100644
--- a/spice/controller_prot.h
+++ b/spice/controller_prot.h
@@ -22,6 +22,10 @@
 #include <spice/types.h>
 #include <spice/start-packed.h>
 
+#ifndef SPICE_DISABLE_DEPRECATED
+#error "This SPICE interface is deprecated"
+#endif
+
 #define CONTROLLER_MAGIC      SPICE_MAGIC_CONST("CTRL")
 #define CONTROLLER_VERSION    1