diff --git a/qucs/components/sparamfile.cpp b/qucs/components/sparamfile.cpp
index 345c14d6..a3dd96ea 100644
--- a/qucs/components/sparamfile.cpp
+++ b/qucs/components/sparamfile.cpp
@@ -207,7 +207,7 @@ QString SParamFile::spice_netlist(bool isXyce)
         QString s_mod = "YLIN_" + Name + "_model";
         for(int i = 0; i < Np; i++) {
             QString p_in = spicecompat::normalize_node_name(Ports.at(i)->Connection->Name);
-            QString p_com = spicecompat::normalize_node_name(Ports.at(Np-1)->Connection->Name);
+            QString p_com = spicecompat::normalize_node_name(Ports.at(Np)->Connection->Name);
             s += QString(" %1 %2").arg(p_in).arg(p_com);
         }
         s += QString(" %1\n").arg(s_mod);