diff --git a/src/tool_main.c b/src/tool_main.c
index 4b8817a2e02f9d3e71a62be7c7e5bbc5ffd01c34..5e1010aa87516bb11fe30e57a0648e81f62ca36c 100644
--- a/src/tool_main.c
+++ b/src/tool_main.c
@@ -52,7 +52,7 @@
  * Its value may be set in other tool_*.c source files thanks to
  * forward declaration present in tool_vms.h
  */
-extern int vms_show = 0;
+int vms_show = 0;
 #endif
 
 /*