diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index da5405d..ff112a8 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -357,7 +357,7 @@
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 
 /* for init task */
-#define INIT_FTRACE_GRAPH		.ret_stack = NULL
+#define INIT_FTRACE_GRAPH		.ret_stack = NULL,
 
 /*
  * Stack of return addresses for functions