diff --git a/shared/nm-glib-aux/nm-macros-internal.h b/shared/nm-glib-aux/nm-macros-internal.h
index 77288dde5..1ff90dc5d 100644
--- a/shared/nm-glib-aux/nm-macros-internal.h
+++ b/shared/nm-glib-aux/nm-macros-internal.h
@@ -635,8 +635,10 @@ NM_G_ERROR_MSG (GError *error)
  * It's useful to check the let the compiler ensure that @value is
  * of a certain type. */
 #define _NM_ENSURE_TYPE(type, value) (_Generic ((value), type: (value)))
+#define _NM_ENSURE_TYPE_CONST(type, value) (_Generic ((value), const type: ((const type) (value)), type: ((const type) (value))))
 #else
 #define _NM_ENSURE_TYPE(type, value) (value)
+#define _NM_ENSURE_TYPE_CONST(type, value) ((const type) (value))
 #endif
 
 #if _NM_CC_SUPPORT_GENERIC