diff --git a/spa/plugins/audioconvert/splitter.c b/spa/plugins/audioconvert/splitter.c
index 86b66d93c..9844596a3 100644
--- a/spa/plugins/audioconvert/splitter.c
+++ b/spa/plugins/audioconvert/splitter.c
@@ -158,12 +158,12 @@ static int init_port(struct impl *this, enum spa_direction direction,
 	port->id = port_id;
 
 	if (position < SPA_N_ELEMENTS(spa_type_audio_channel)) {
-		snprintf(port->position, 16, "%s",
+		snprintf(port->position, 7, "%s",
 				spa_debug_type_short_name(spa_type_audio_channel[position].name));
 	} else if (position >= SPA_AUDIO_CHANNEL_CUSTOM_START) {
-		snprintf(port->position, 16, "AUX%d", position - SPA_AUDIO_CHANNEL_CUSTOM_START);
+		snprintf(port->position, 7, "AUX%d", position - SPA_AUDIO_CHANNEL_CUSTOM_START);
 	} else {
-		snprintf(port->position, 16, "UNK");
+		snprintf(port->position, 7, "UNK");
 	}
 
 	port->info_all = SPA_PORT_CHANGE_MASK_FLAGS |