diff --git a/themes/command_duration.theme.bash b/themes/command_duration.theme.bash
index 7c19ffda..42c58904 100644
--- a/themes/command_duration.theme.bash
+++ b/themes/command_duration.theme.bash
@@ -6,10 +6,10 @@ fi
 
 # Define tmp dir and file
 COMMAND_DURATION_TMPDIR="${TMPDIR:-/tmp}"
-COMMAND_DURATION_FILE="$COMMAND_DURATION_TMPDIR/bashit_theme_execution_$BASHPID"
+COMMAND_DURATION_FILE="${COMMAND_DURATION_FILE:-$COMMAND_DURATION_TMPDIR/bashit_theme_execution_$BASHPID}"
 
-COMMAND_DURATION_ICON='  '
-COMMAND_DURATION_MIN_SECONDS='1'
+COMMAND_DURATION_ICON=${COMMAND_DURATION_ICON:-'  '}
+COMMAND_DURATION_MIN_SECONDS=${COMMAND_DURATION_MIN_SECONDS:-'1'}
 
 trap _command_duration_delete_temp_file EXIT HUP INT TERM