diff --git a/Docs/src/compiler.but b/Docs/src/compiler.but
index 4ab18983..8a175cef 100644
--- a/Docs/src/compiler.but
+++ b/Docs/src/compiler.but
@@ -75,7 +75,7 @@ On POSIX platforms, !execute will use system() just like \R{system}{!system}.
 
 This option makes the compiler use an external EXE packer (such as \W{http://www.un4seen.com/petite/}{Petite} or \W{http://upx.sourceforge.net/}{UPX}) to compress the executable header. Specify a temporary file name (such as "temp.dat") and a command line (such as "C:\\program files\\upx\\upx -9 temp.dat") to compress the header.
 
-\c !packhdr "%TEMP%\exehead.tmp" '"C:\Program Files\UPX\upx.exe" "%TEMP%\exehead.tmp"'
+\c !packhdr "$%TEMP%\exehead.tmp" '"C:\Program Files\UPX\upx.exe" "$%TEMP%\exehead.tmp"'
 
 \S1{system} !system