diff --git a/libs/ardour/ladspa_plugin.cc b/libs/ardour/ladspa_plugin.cc
index f30925ac51..40d8b68951 100644
--- a/libs/ardour/ladspa_plugin.cc
+++ b/libs/ardour/ladspa_plugin.cc
@@ -350,7 +350,7 @@ void
 LadspaPlugin::add_state (XMLNode* root) const
 {
 	XMLNode *child;
-	char buf[16];
+	char buf[32];
 	LocaleGuard lg (X_("C"));
 
 	for (uint32_t i = 0; i < parameter_count(); ++i){