diff --git a/linux/.bashrc b/linux/.bashrc
index b58bf98..6744b8b 100755
--- a/linux/.bashrc
+++ b/linux/.bashrc
@@ -31,12 +31,14 @@ export HISTCONTROL=ignoreboth:erasedups  # no duplicate entries
 export HISTFILESIZE=2500000
 export HISTSIZE=250000
 
-# ensure synchronization between bash memory and history file
-export PROMPT_COMMAND="history -a; history -n; ${PROMPT_COMMAND}"
-if [[ $- =~ .*i.* ]]; then bind '"\C-r": "\C-a hstr -- \C-j"'; fi
-# if this is interactive shell, then bind 'kill last command' to Ctrl-x k
-if [[ $- =~ .*i.* ]]; then bind '"\C-xk": "\C-a hstr -k \C-j"'; fi
-export HSTR_TIOCSTI=y
+if type hstr >/dev/null 2>&1; then
+  # ensure synchronization between bash memory and history file
+  export PROMPT_COMMAND="history -a; history -n; ${PROMPT_COMMAND}"
+  if [[ $- =~ .*i.* ]]; then bind '"\C-r": "\C-a hstr -- \C-j"'; fi
+  # if this is interactive shell, then bind 'kill last command' to Ctrl-x k
+  if [[ $- =~ .*i.* ]]; then bind '"\C-xk": "\C-a hstr -k \C-j"'; fi
+  export HSTR_TIOCSTI=y
+fi
 
 # If not running interactively, don't do anything
 case $- in