diff --git a/src/db/db/dbNetlistSpiceWriter.cc b/src/db/db/dbNetlistSpiceWriter.cc
index 833cd1af5..0a06a87ab 100644
--- a/src/db/db/dbNetlistSpiceWriter.cc
+++ b/src/db/db/dbNetlistSpiceWriter.cc
@@ -135,7 +135,7 @@ void NetlistSpiceWriterDelegate::write_device (const db::Device &dev) const
     os << format_name (dev.expanded_name ());
     os << format_terminals (dev);
 
-    if (mos3) {
+    if (! mos4) {
       //  we assume for the MOS3 type the bulk is connected to Source
       os << " ";
       os << net_to_string (dev.net_for_terminal (db::DeviceClassMOS3Transistor::terminal_id_S));
diff --git a/testdata/algo/nwriter6_au.txt b/testdata/algo/nwriter6_au.txt
index 349757227..50133a5d9 100644
--- a/testdata/algo/nwriter6_au.txt
+++ b/testdata/algo/nwriter6_au.txt
@@ -12,7 +12,7 @@
 * net 4 n4
 * net 5 n5
 * device instance $1 0,0 M4CLS
-M$1 1 4 3 5 1 MM4CLS L=0.25U W=0.18U AS=1.2U AD=0.75U PS=2.2U PD=1.75U
+M$1 1 4 3 5 MM4CLS L=0.25U W=0.18U AS=1.2U AD=0.75U PS=2.2U PD=1.75U
 * device instance $2 0,0 M4CLS
-M$2 3 4 2 5 3 MM4CLS L=1.4U W=0.25U AS=1.3U AD=0.85U PS=2.3U PD=1.85U
+M$2 3 4 2 5 MM4CLS L=1.4U W=0.25U AS=1.3U AD=0.85U PS=2.3U PD=1.85U
 .ENDS C1
diff --git a/testdata/algo/nwriter8_au.txt b/testdata/algo/nwriter8_au.txt
index f5d4cb619..812ebff0f 100644
--- a/testdata/algo/nwriter8_au.txt
+++ b/testdata/algo/nwriter8_au.txt
@@ -28,7 +28,7 @@ XSC2 3 2 4 3 C1
 * net 4 n4
 * net 5 n5
 * device instance $1 0,0 M4CLS
-M$1 1 4 3 5 1 MM4CLS L=0.25U W=0.18U AS=1.2U AD=0.75U PS=2.2U PD=1.75U
+M$1 1 4 3 5 MM4CLS L=0.25U W=0.18U AS=1.2U AD=0.75U PS=2.2U PD=1.75U
 * device instance $2 0,0 M4CLS
-M$2 3 4 2 5 3 MM4CLS L=1.4U W=0.25U AS=1.3U AD=0.85U PS=2.3U PD=1.85U
+M$2 3 4 2 5 MM4CLS L=1.4U W=0.25U AS=1.3U AD=0.85U PS=2.3U PD=1.85U
 .ENDS C1