diff --git a/powerline/bindings/bash/powerline.sh b/powerline/bindings/bash/powerline.sh
index eb705a7c..b267c076 100644
--- a/powerline/bindings/bash/powerline.sh
+++ b/powerline/bindings/bash/powerline.sh
@@ -41,7 +41,12 @@ _powerline_init_tmux_support() {
 
 _powerline_prompt() {
 	# Arguments: side, last_exit_code, jobnum
-	$POWERLINE_COMMAND shell $1 -w "${COLUMNS:-$(_powerline_columns_fallback)}" -r bash_prompt --last_exit_code=$2 --jobnum=$3
+	$POWERLINE_COMMAND shell $1 \
+		-w "${COLUMNS:-$(_powerline_columns_fallback)}" \
+		-r bash_prompt \
+		--last_exit_code=$2 \
+		--jobnum=$3 \
+		--renderer_arg="client_id=$$"
 }
 
 _powerline_set_prompt() {
diff --git a/powerline/bindings/fish/powerline-setup.fish b/powerline/bindings/fish/powerline-setup.fish
index 56f6d52e..6dc100c0 100644
--- a/powerline/bindings/fish/powerline-setup.fish
+++ b/powerline/bindings/fish/powerline-setup.fish
@@ -34,6 +34,9 @@ function powerline-setup
 			set -l addargs "--last_exit_code=\$status"
 			set -l addargs "$addargs --last_pipe_status=\$status"
 			set -l addargs "$addargs --jobnum=(jobs -p | wc -l)"
+			# One random value has an 1/32767 = 0.0031% probability of having 
+			# the same value in two shells
+			set -l addargs "$addargs --renderer_arg=client_id="(random)
 			set -l addargs "$addargs --width=\$_POWERLINE_COLUMNS"
 			set -l promptside
 			set -l rpromptpast
diff --git a/powerline/bindings/shell/powerline.sh b/powerline/bindings/shell/powerline.sh
index e78e3625..89da8d8f 100644
--- a/powerline/bindings/shell/powerline.sh
+++ b/powerline/bindings/shell/powerline.sh
@@ -134,7 +134,12 @@ _powerline_set_jobs() {
 _powerline_prompt() {
 	# Arguments: side, exit_code
 	_powerline_set_jobs
-	$POWERLINE_COMMAND shell $1 -w "${COLUMNS:-$(_powerline_columns_fallback)}" $_POWERLINE_RENDERER_ARG --last_exit_code=$2 --jobnum=$_POWERLINE_JOBS
+	$POWERLINE_COMMAND shell $1 \
+		-w "${COLUMNS:-$(_powerline_columns_fallback)}" \
+		$_POWERLINE_RENDERER_ARG \
+		--renderer_arg="client_id=$$" \
+		--last_exit_code=$2 \
+		--jobnum=$_POWERLINE_JOBS
 }
 
 _powerline_setup_prompt() {
diff --git a/powerline/bindings/tcsh/powerline.tcsh b/powerline/bindings/tcsh/powerline.tcsh
index 5ac0cf33..48155466 100644
--- a/powerline/bindings/tcsh/powerline.tcsh
+++ b/powerline/bindings/tcsh/powerline.tcsh
@@ -24,11 +24,11 @@ if ( { $POWERLINE_CONFIG shell --shell=tcsh uses prompt } ) then
 	if ( $?POWERLINE_NO_TCSH_ABOVE || $?POWERLINE_NO_SHELL_ABOVE ) then
 		alias _powerline_above true
 	else
-		alias _powerline_above '$POWERLINE_COMMAND shell above --last_exit_code=$POWERLINE_STATUS --width=$POWERLINE_COLUMNS'
+		alias _powerline_above '$POWERLINE_COMMAND shell above --renderer_arg=client_id=$$ --last_exit_code=$POWERLINE_STATUS --width=$POWERLINE_COLUMNS'
 	endif
 
-	alias _powerline_set_prompt 'set prompt="`$POWERLINE_COMMAND shell left -r tcsh_prompt --last_exit_code=$POWERLINE_STATUS --width=$POWERLINE_COLUMNS`"'
-	alias _powerline_set_rprompt 'set rprompt="`$POWERLINE_COMMAND shell right -r tcsh_prompt --last_exit_code=$POWERLINE_STATUS --width=$POWERLINE_COLUMNS` "'
+	alias _powerline_set_prompt 'set prompt="`$POWERLINE_COMMAND shell left -r tcsh_prompt --renderer_arg=client_id=$$ --last_exit_code=$POWERLINE_STATUS --width=$POWERLINE_COLUMNS`"'
+	alias _powerline_set_rprompt 'set rprompt="`$POWERLINE_COMMAND shell right -r tcsh_prompt --renderer_arg=client_id=$$ --last_exit_code=$POWERLINE_STATUS --width=$POWERLINE_COLUMNS` "'
 	alias _powerline_set_columns 'set POWERLINE_COLUMNS=`stty size|cut -d" " -f2` ; set POWERLINE_COLUMNS=`expr $POWERLINE_COLUMNS - 2`'
 
 	alias precmd 'set POWERLINE_STATUS=$? ; '"`alias precmd`"' ; _powerline_set_columns ; _powerline_above ; _powerline_set_prompt ; _powerline_set_rprompt'