diff --git a/modules/video_output/x11/xcommon.h b/modules/video_output/x11/xcommon.h
index a72c8a8854..4e4eeacbd9 100644
--- a/modules/video_output/x11/xcommon.h
+++ b/modules/video_output/x11/xcommon.h
@@ -107,7 +107,7 @@ struct vout_sys_t
     /* X11 generic properties */
     vlc_bool_t          b_altfullscreen;          /* which fullscreen method */
 #ifdef HAVE_SYS_SHM_H
-    vlc_bool_t          i_shm_opcode;      /* shared memory extension opcode */
+    int                 i_shm_opcode;      /* shared memory extension opcode */
 #endif
 
 #if defined(MODULE_NAME_IS_xvideo) || defined(MODULE_NAME_IS_xvmc)