diff --git a/tools/tinderbox/post-mozilla-rel.pl b/tools/tinderbox/post-mozilla-rel.pl
index df57b4b55399..04fad4b1b3eb 100755
--- a/tools/tinderbox/post-mozilla-rel.pl
+++ b/tools/tinderbox/post-mozilla-rel.pl
@@ -67,7 +67,7 @@ sub makefullsoft {
   $fullsofttag = " -r $Settings::BuildTag"
         unless not defined($Settings::BuildTag) or $Settings::BuildTag eq '';
   TinderUtils::run_shell_command "cd $builddir; cvs -d$moforoot co $fullsofttag -d fullsoft talkback/fullsoft";
-  TinderUtils::run_shell_command "$builddir/build/autoconf/make-makefile $builddir/fullsoft";
+  TinderUtils::run_shell_command "cd $builddir/fullsoft; $builddir/build/autoconf/make-makefile";
   TinderUtils::run_shell_command "make -C $builddir/fullsoft";
   TinderUtils::run_shell_command "make -C $builddir/fullsoft fullcircle-push";
 }