diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 6a46967192975b0c90fb8df0bd36f49ffb44c24f..6a942fa275c788fc5408204292d997ae88b5aa68 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -155,7 +155,7 @@ int trace_define_field(struct trace_event_call *call, const char *type,
 }
 EXPORT_SYMBOL_GPL(trace_define_field);
 
-int trace_define_field_ext(struct trace_event_call *call, const char *type,
+static int trace_define_field_ext(struct trace_event_call *call, const char *type,
 		       const char *name, int offset, int size, int is_signed,
 		       int filter_type, int len)
 {