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--- a/upmpd/ohvolume.cxx
+++ b/upmpd/ohvolume.cxx
@@ -79,7 +79,7 @@
     st["BalanceMax"] = "0";
     st["FadeMax"] = "0";
     int volume = m_ctl->getvolume_i();
-    st["Volume"] = SoapArgs::i2s(volume);
+    st["Volume"] = SoapHelp::i2s(volume);
     st["Mute"] = volume == 0 ? "1" : "0";
     return true;
 }
@@ -166,7 +166,7 @@
 int OHVolume::volume(const SoapArgs& sc, SoapData& data)
 {
     LOGDEB("OHVolume::volume" << endl);
-    data.addarg("Value", SoapArgs::i2s(m_ctl->getvolume_i()));
+    data.addarg("Value", SoapHelp::i2s(m_ctl->getvolume_i()));
     return UPNP_E_SUCCESS;
 }