--- a/build/autoconf/hooks.m4
+++ b/build/autoconf/hooks.m4
@@ -42,17 +42,17 @@ define([AC_OUTPUT_SUBDIRS],
     if test ! -e "$_CONFIG_SHELL" -a -e "${_CONFIG_SHELL}.exe"; then
         _CONFIG_SHELL="${_CONFIG_SHELL}.exe"
     fi
     dnl Yes, this is horrible. But since msys doesn't preserve environment
     dnl variables and command line arguments as they are when transitioning
     dnl from msys (this script) to python (below), we have to resort to hacks,
     dnl storing the environment and command line arguments from a msys process
     dnl (perl), and reading it from python.
-    dumpenv="$PERL $srcdir/build/win32/dumpenv4python.pl $ac_configure_args | "
+    dumpenv="$PERL $_topsrcdir/build/win32/dumpenv4python.pl $ac_configure_args | "
     ;;
   esac
 
   eval $dumpenv $PYTHON $_topsrcdir/build/subconfigure.py --prepare "$srcdir" "$moz_config_dir" "$_CONFIG_SHELL" $ac_configure_args ifelse($2,,,--cache-file="$2")
 
   dnl Execute subconfigure, unless --no-recursion was passed to configure.
   if test "$no_recursion" != yes; then
     trap '' EXIT