diff --git a/trace.c b/trace.c
index 1e560cb0b9..62586fa371 100644
--- a/trace.c
+++ b/trace.c
@@ -25,7 +25,7 @@
 #include "cache.h"
 #include "quote.h"
 
-void do_nothing(size_t unused)
+static void do_nothing(size_t unused)
 {
 }