diff --git a/gfx/display_servers/dispserv_x11.c b/gfx/display_servers/dispserv_x11.c
index 7c8dea86fb..adaa7ccd4f 100644
--- a/gfx/display_servers/dispserv_x11.c
+++ b/gfx/display_servers/dispserv_x11.c
@@ -43,6 +43,7 @@ static char output[500]         = {0};
 static char output4[500]         = {0};
 static bool crt_en              = false;
 static unsigned crtid           = 20;
+static XRRModeInfo crt_rrmode;
 
 typedef struct
 {