diff --git a/import_mbox.sh b/import_mbox.sh
index 053e3d729f1a594a8f68040f1b47b5e982760e6d..2f617368d9c5954778f10f5377e595fc16848df1 100755
--- a/import_mbox.sh
+++ b/import_mbox.sh
@@ -3,6 +3,9 @@
 set -e
 
 base=$(dirname $0)
+if [ "$base" == '.' ]; then
+    base="$PWD"
+fi
 
 # import_mbox
 # List archive import