diff --git a/powerline/bindings/bash/powerline.sh b/powerline/bindings/bash/powerline.sh
index 4aeefea6..6f1de23b 100644
--- a/powerline/bindings/bash/powerline.sh
+++ b/powerline/bindings/bash/powerline.sh
@@ -10,7 +10,7 @@ if test -z "${POWERLINE_COMMAND}" ; then
 fi
 
 _powerline_init_tmux_support() {
-	if test -n "$TMUX" && tmux source-file /dev/null &>/dev/null ; then
+	if test -n "$TMUX" && tmux refresh -S &>/dev/null ; then
 		# TMUX variable may be unset to create new tmux session inside this one
 		_POWERLINE_TMUX="$TMUX"
 
diff --git a/powerline/bindings/fish/powerline-setup.fish b/powerline/bindings/fish/powerline-setup.fish
index 71acb3cb..d925a6fc 100644
--- a/powerline/bindings/fish/powerline-setup.fish
+++ b/powerline/bindings/fish/powerline-setup.fish
@@ -21,7 +21,7 @@ function powerline-setup
 	end
 	_powerline_update
 	if test -n "$TMUX"
-		if tmux source-file /dev/null ^/dev/null
+		if tmux refresh -S ^/dev/null
 			function _powerline_tmux_setenv
 				tmux setenv -g TMUX_$argv[1]_(tmux display -p "#D" | tr -d "%") "$argv[2]"
 				tmux refresh -S
diff --git a/powerline/bindings/tcsh/powerline.tcsh b/powerline/bindings/tcsh/powerline.tcsh
index b83498ad..68e031e8 100644
--- a/powerline/bindings/tcsh/powerline.tcsh
+++ b/powerline/bindings/tcsh/powerline.tcsh
@@ -14,7 +14,7 @@ if ! $?POWERLINE_COMMAND then
 		setenv POWERLINE_COMMAND $POWERLINE_SOURCED:h:h:h:h:q/scripts/powerline
 	endif
 endif
-alias _powerline_tmux_set_pwd 'if ( $?TMUX && { tmux source-file /dev/null >&/dev/null } ) tmux setenv -g TMUX_PWD_`tmux display -p "#D" | tr -d %` $PWD:q ; if ( $?TMUX && { tmux source-file /dev/null >&/dev/null } ) tmux refresh -S'
+alias _powerline_tmux_set_pwd 'if ( $?TMUX && { tmux refresh -S >&/dev/null } ) tmux setenv -g TMUX_PWD_`tmux display -p "#D" | tr -d %` $PWD:q ; if ( $?TMUX ) tmux refresh -S >&/dev/null'
 alias _powerline_set_prompt 'set prompt="`$POWERLINE_COMMAND shell left -r tcsh_prompt --last_exit_code=$?`"'
 alias _powerline_set_rprompt 'set rprompt="`$POWERLINE_COMMAND shell right -r tcsh_prompt --last_exit_code=$?` "'
 alias cwdcmd "`alias cwdcmd` ; _powerline_tmux_set_pwd"
diff --git a/powerline/bindings/zsh/powerline.zsh b/powerline/bindings/zsh/powerline.zsh
index 46123940..838a99a7 100644
--- a/powerline/bindings/zsh/powerline.zsh
+++ b/powerline/bindings/zsh/powerline.zsh
@@ -12,7 +12,7 @@ integer _POWERLINE_JOBNUM
 
 _powerline_init_tmux_support() {
 	emulate -L zsh
-	if test -n "$TMUX" && tmux source-file /dev/null &>/dev/null ; then
+	if test -n "$TMUX" && tmux refresh -S &>/dev/null ; then
 		# TMUX variable may be unset to create new tmux session inside this one
 		typeset -g _POWERLINE_TMUX="$TMUX"