diff --git a/src/rig.c b/src/rig.c
index 8cd7dabd3..48605b8fd 100644
--- a/src/rig.c
+++ b/src/rig.c
@@ -93,7 +93,7 @@ const char *hamlib_license = "LGPL";
 const char hamlib_version[21] = "Hamlib " PACKAGE_VERSION;
 const char *hamlib_version2 = "Hamlib " PACKAGE_VERSION " " HAMLIBDATETIME;
 HAMLIB_EXPORT_VAR(int) cookie_use;
-int lock_mode; // for use by rigctld
+HAMLIB_EXPORT_VAR(int) lock_mode; // for use by rigctld
 //! @endcond
 
 struct rig_caps caps_test;