diff --git a/tests/tcg/i386/hello-i386.c b/tests/tcg/i386/hello-i386.c
index fa00380de2..cfeb24b2f5 100644
--- a/tests/tcg/i386/hello-i386.c
+++ b/tests/tcg/i386/hello-i386.c
@@ -20,6 +20,7 @@ static inline int write(int fd, const char * buf, int len)
   return status;
 }
 
+void _start(void);
 void _start(void)
 {
     write(1, "Hello World\n", 12);