diff --git a/functions.sh b/functions.sh
index 120b73f..e01f2d7 100755
--- a/functions.sh
+++ b/functions.sh
@@ -9,11 +9,12 @@ export TMUX_SESSION_DIRS SETPROXY_CREDS_DIRS KERBEROS_CONFIG_DIRS
 ## this function updates in combination with PROMPT_COMMAND the shell-environment-variables in tmus-sessions,
 #  every time prompt is called. It does it only, when called from tmux (Environment TMUX is set)
 function prompt_command() {
-    [ -z "${TMUX+x}" ] || eval "$(tmux show-environment -s)"
+#    [ -z "${TMUX+x}" ] || eval "$(tmux show-environment -s)"
+
+    if [ -n "${TMUX}" ]; then
+        eval "$(tmux show-environment -s)"
+    fi
 
-#    if [ -n "${TMUX}" ]; then
-#        eval "$(tmux show-environment -s)"
-#    fi
 }
 PROMPT_COMMAND=prompt_command