diff --git a/todo.sh b/todo.sh
index 1e6d83e..f9997d8 100755
--- a/todo.sh
+++ b/todo.sh
@@ -307,6 +307,9 @@ TODOTXT_DATE_ON_ADD=${TODOTXT_DATE_ON_ADD:-0}
 
 export TODOTXT_VERBOSE TODOTXT_PLAIN TODOTXT_CFG_FILE TODOTXT_FORCE TODOTXT_PRESERVE_LINE_NUMBERS TODOTXT_AUTO_ARCHIVE TODOTXT_DATE_ON_ADD
 
+TODO_SH="$0"
+export TODO_SH
+
 # === SANITY CHECKS (thanks Karl!) ===
 [ -r "$TODOTXT_CFG_FILE" ] || die "Fatal error:  Cannot read configuration file $TODOTXT_CFG_FILE"