diff --git a/libs/ardour/ardour/rc_configuration_vars.h b/libs/ardour/ardour/rc_configuration_vars.h
index 744136626d..d79e9b94e3 100644
--- a/libs/ardour/ardour/rc_configuration_vars.h
+++ b/libs/ardour/ardour/rc_configuration_vars.h
@@ -218,6 +218,7 @@ CONFIG_VARIABLE_SPECIAL (std::string, default_session_parent_dir, "default-sessi
 #else
 CONFIG_VARIABLE_SPECIAL (std::string, default_session_parent_dir, "default-session-parent-dir", "~", poor_mans_glob)
 #endif
+CONFIG_VARIABLE (std::string, sample_lib_path, "sample-lib-path", "")
 CONFIG_VARIABLE (bool, allow_special_bus_removal, "allow-special-bus-removal", false)
 CONFIG_VARIABLE (int32_t, processor_usage, "processor-usage", -1)
 CONFIG_VARIABLE (int32_t, cpu_dma_latency, "cpu-dma-latency", -1) /* >=0 to enable */