diff --git a/libcontainer/nsenter/log.h b/libcontainer/nsenter/log.h
index 124d9da7e..1fe95a111 100644
--- a/libcontainer/nsenter/log.h
+++ b/libcontainer/nsenter/log.h
@@ -20,7 +20,7 @@
  */
 void setup_logpipe(void);
 
-void write_log(int level, const char *format, ...);
+void write_log(int level, const char *format, ...) __attribute__((format(printf, 2, 3)));
 
 extern int logfd;
 #define bail(fmt, ...)                                               \