diff --git a/scripts/sd_tag_batch.py b/scripts/sd_tag_batch.py
index f5e3980..5b0fb14 100644
--- a/scripts/sd_tag_batch.py
+++ b/scripts/sd_tag_batch.py
@@ -672,8 +672,7 @@ class Script(scripts.ScriptBuiltinUI):
             if prompt == "":
                 prompt = interrogation
             elif in_front == "Append to prompt":
-                interrogation = f", {interrogation}"
-                prompt = f"{prompt}{interrogation}"
+                prompt = f"{prompt.rstrip(', ')}, {interrogation}"
             else:
                 prompt = f"{interrogation}{prompt}"