diff --git a/mysys/stacktrace.c b/mysys/stacktrace.c
index ba62062ebc0..451a2c7d06a 100644
--- a/mysys/stacktrace.c
+++ b/mysys/stacktrace.c
@@ -315,6 +315,9 @@ end:
 /* Produce a core for the thread */
 void my_write_core(int sig)
 {
+#ifdef HAVE_gcov
+  extern void __gcov_flush(void);
+#endif
   signal(sig, SIG_DFL);
 #ifdef HAVE_gcov
   /*
@@ -322,7 +325,6 @@ void my_write_core(int sig)
     information from this process, causing gcov output to be incomplete.
     So we force the writing of coverage information here before terminating.
   */
-  extern void __gcov_flush(void);
   __gcov_flush();
 #endif
   pthread_kill(pthread_self(), sig);