diff --git a/xschem_library/devices/sqwsource.sym b/xschem_library/devices/sqwsource.sym
index caa6ac91..ae8b8504 100644
--- a/xschem_library/devices/sqwsource.sym
+++ b/xschem_library/devices/sqwsource.sym
@@ -1,13 +1,13 @@
 v {xschem version=2.9.8 file_version=1.2}
 G {}
 K {type=vsource
-format="tcleval( @name @pinlist \\\\
+format="@name @pinlist \\\\
 pulse 0 @vhi \\\\
-[expr 0.495/ @freq\\\\] \\\\
-[expr 0.01/@freq ] \\\\
-[expr 0.01/@freq ] \\\\
-[expr 0.49/@freq ] \\\\
-[expr 1/@freq ] )"
+'0.495/ @freq ' \\\\
+'0.01/@freq ' \\\\
+'0.01/@freq ' \\\\
+'0.49/@freq ' \\\\
+'1/@freq '"
 template="name=V1 vhi=3 freq=1e6"
 }
 V {}