diff --git a/_home/dot_sz.shrc.d/bash.post/11_persistent.history b/_home/dot_sz.shrc.d/bash.post/11_persistent.history
index 0a5fcde..bce26ab 100644
--- a/_home/dot_sz.shrc.d/bash.post/11_persistent.history
+++ b/_home/dot_sz.shrc.d/bash.post/11_persistent.history
@@ -4,4 +4,6 @@ export HISTFILESIZE=100000              # big big history
 shopt -s histappend                     # append to history, don't overwrite it
 
 # Save and reload the history after each command finishes
-export PROMPT_COMMAND="history -a; history -c; history -r; $PROMPT_COMMAND"
+if ! [[ "$PROMPT_COMMAND" =~ "history -a; history -c; history -r;" ]]; then
+   export PROMPT_COMMAND="history -a; history -c; history -r; $PROMPT_COMMAND"
+fi