diff --git a/tools/test-harness/xpcshell-simple/test_one.sh b/tools/test-harness/xpcshell-simple/test_one.sh
index 5cff31321ea1..3483a35a3ca7 100755
--- a/tools/test-harness/xpcshell-simple/test_one.sh
+++ b/tools/test-harness/xpcshell-simple/test_one.sh
@@ -133,7 +133,7 @@ done
 echo "NATIVE_TOPSRCDIR='$native_topsrcdir' TOPSRCDIR='$topsrcdir' $xpcshell -s $headfiles -f $testdir/$target_dir/$target_js $tailfiles 2>&1"
 echo -n "$target_js: "
 if [ ! "$interactive_mode" = "1" ]; then
-    NATIVE_TOPSRCDIR="$native_topsrcdir" TOPSRCDIR="$topsrcdir" $xpcshell -s $headfiles -f $testdir/$target_dir/$target_js $tailfiles  2> $testdir/$target_js.log 1>&2
+    NATIVE_TOPSRCDIR="$native_topsrcdir" TOPSRCDIR="$topsrcdir" $xpcshell -s $headfiles -f $testdir/$target_dir/$target_js $tailfiles  2> $testdir/$target_dir/$target_js.log 1>&2
 else
     NATIVE_TOPSRCDIR="$native_topsrcdir" TOPSRCDIR="$topsrcdir" $xpcshell -s $headfiles -f $testdir/$target_dir/$target_js $tailfiles -i 2>&1
 fi