diff --git a/libs/ardour/vst_plugin.cc b/libs/ardour/vst_plugin.cc
index 83d7dc2ced..554ca9d4d1 100644
--- a/libs/ardour/vst_plugin.cc
+++ b/libs/ardour/vst_plugin.cc
@@ -512,7 +512,11 @@ VSTPlugin::signal_latency () const
 		return _user_latency;
 	}
 
+#if ( defined(__x86_64__) || defined(_M_X64) )
+	return *((int32_t *) (((char *) &_plugin->flags) + 20)); /* initialDelay */
+#else
 	return *((int32_t *) (((char *) &_plugin->flags) + 12)); /* initialDelay */
+#endif
 }
 
 set<Evoral::Parameter>