diff --git a/libavdevice/x11grab.c b/libavdevice/x11grab.c
index c707ae82ac..9031f946bf 100644
--- a/libavdevice/x11grab.c
+++ b/libavdevice/x11grab.c
@@ -223,7 +223,7 @@ static int x11grab_read_header(AVFormatContext *s1)
 
     use_shm = XShmQueryExtension(dpy);
     av_log(s1, AV_LOG_INFO,
-           "shared memory extension %s found\n", use_shm ? "" : "not");
+           "shared memory extension %sfound\n", use_shm ? "" : "not ");
 
     if (use_shm) {
         int scr = XDefaultScreen(dpy);