diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h
index db1c26d..a12d117 100644
--- a/fs/gfs2/glock.h
+++ b/fs/gfs2/glock.h
@@ -212,6 +212,8 @@
 int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
 void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
 void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
+
+__attribute__ ((format(printf, 2, 3)))
 void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...);
 
 /**