diff --git a/spcd/bootstrap.sh b/spcd/bootstrap.sh
index 223a224..366f599 100644
--- a/spcd/bootstrap.sh
+++ b/spcd/bootstrap.sh
@@ -46,6 +46,7 @@ _spcd_fill() {
         printf "%s" "${2}"
         _spcd_fill__index=$((_spcd_fill__index - 1))
     done
+    unset _spcd_fill__index
 }
 
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