diff --git a/xschem_library/devices/simulator_commands.sym b/xschem_library/devices/simulator_commands.sym
index 4e227033..6acf6e91 100644
--- a/xschem_library/devices/simulator_commands.sym
+++ b/xschem_library/devices/simulator_commands.sym
@@ -1,4 +1,4 @@
-v {xschem version=3.4.6 file_version=1.2
+v {xschem version=3.4.8RC file_version=1.3
 *
 * This file is part of XSCHEM,
 * a schematic capture and Spice/Vhdl/Verilog netlisting tool for circuit
@@ -35,9 +35,17 @@ format="tcleval(
 \}
 \} else \{ return \{\} \}
 ])"
-}
+
+spectre_format="tcleval(
+[if \{[catch \{sim_is_@simulator \} retval] \} \{
+  return \{\} \} elseif \{$retval\} \{ return \{
+@value
+\}
+\} else \{ return \{\} \}
+])"}
 V {}
 S {}
+F {}
 E {}
 L 4 20 30 60 30 {}
 L 4 20 40 40 40 {}
diff --git a/xschem_library/devices/simulator_commands_shown.sym b/xschem_library/devices/simulator_commands_shown.sym
index 080eb041..074c382b 100644
--- a/xschem_library/devices/simulator_commands_shown.sym
+++ b/xschem_library/devices/simulator_commands_shown.sym
@@ -1,4 +1,4 @@
-v {xschem version=3.4.6 file_version=1.2
+v {xschem version=3.4.8RC file_version=1.3
 *
 * This file is part of XSCHEM,
 * a schematic capture and Spice/Vhdl/Verilog netlisting tool for circuit
@@ -34,9 +34,18 @@ format="tcleval(
 @value
 \}
 \} else \{ return \{\} \}
+])"
+
+spectre_format="tcleval(
+[if \{[catch \{sim_is_@simulator \} retval] \} \{
+  return \{\} \} elseif \{$retval\} \{ return \{
+@value
+\}
+\} else \{ return \{\} \}
 ])"}
 V {}
 S {}
+F {}
 E {}
 L 4 0 -10 70 -10 {}
 L 4 0 -10 0 10 {}