diff --git a/boards/arm/samv7/same70-xplained/README.txt b/boards/arm/samv7/same70-xplained/README.txt
index fc4707201b..561080aafe 100644
--- a/boards/arm/samv7/same70-xplained/README.txt
+++ b/boards/arm/samv7/same70-xplained/README.txt
@@ -1410,7 +1410,6 @@ Configuration sub-directories
          CONFIG_PTHREAD_STACK_DEFAULT=2048
          CONFIG_POSIX_SPAWN_PROXY_STACKSIZE=1024
          CONFIG_TASK_SPAWN_DEFAULT_STACKSIZE=2048
-         CONFIG_BUILTIN_PROXY_STACKSIZE=1024
          CONFIG_NSH_TELNETD_DAEMONSTACKSIZE=2048
          CONFIG_NSH_TELNETD_CLIENTSTACKSIZE=2048
 
diff --git a/boards/arm/samv7/samv71-xult/README.txt b/boards/arm/samv7/samv71-xult/README.txt
index 8b09a6df06..fc55bbdab5 100644
--- a/boards/arm/samv7/samv71-xult/README.txt
+++ b/boards/arm/samv7/samv71-xult/README.txt
@@ -2096,7 +2096,6 @@ Configuration sub-directories
          CONFIG_PTHREAD_STACK_DEFAULT=2048
          CONFIG_POSIX_SPAWN_PROXY_STACKSIZE=1024
          CONFIG_TASK_SPAWN_DEFAULT_STACKSIZE=2048
-         CONFIG_BUILTIN_PROXY_STACKSIZE=1024
          CONFIG_NSH_TELNETD_DAEMONSTACKSIZE=2048
          CONFIG_NSH_TELNETD_CLIENTSTACKSIZE=2048
 
diff --git a/boards/arm/stm32f0l0g0/nucleo-f072rb/README.txt b/boards/arm/stm32f0l0g0/nucleo-f072rb/README.txt
index 8d2bc9a174..d60220e22c 100644
--- a/boards/arm/stm32f0l0g0/nucleo-f072rb/README.txt
+++ b/boards/arm/stm32f0l0g0/nucleo-f072rb/README.txt
@@ -308,7 +308,6 @@ Configurations
          CONFIG_ARCH_IRQBUTTONS=y
 
          CONFIG_BUILTIN=y
-         CONFIG_BUILTIN_PROXY_STACKSIZE=1024
 
          CONFIG_FS_PROCFS=y
          CONFIG_NSH_PROC_MOUNTPOINT="/proc"
diff --git a/boards/arm/stm32f0l0g0/nucleo-f091rc/README.txt b/boards/arm/stm32f0l0g0/nucleo-f091rc/README.txt
index 2c86521aad..96482b54cc 100644
--- a/boards/arm/stm32f0l0g0/nucleo-f091rc/README.txt
+++ b/boards/arm/stm32f0l0g0/nucleo-f091rc/README.txt
@@ -294,7 +294,6 @@ Configurations
          CONFIG_ARCH_IRQBUTTONS=y
 
          CONFIG_BUILTIN=y
-         CONFIG_BUILTIN_PROXY_STACKSIZE=1024
 
          CONFIG_FS_PROCFS=y
          CONFIG_NSH_PROC_MOUNTPOINT="/proc"
diff --git a/boards/arm/tiva/dk-tm4c129x/README.txt b/boards/arm/tiva/dk-tm4c129x/README.txt
index a167b414f3..63fd7f8922 100644
--- a/boards/arm/tiva/dk-tm4c129x/README.txt
+++ b/boards/arm/tiva/dk-tm4c129x/README.txt
@@ -685,7 +685,6 @@ Where <subdir> is one of the following:
          CONFIG_PTHREAD_STACK_DEFAULT=2048
          CONFIG_POSIX_SPAWN_PROXY_STACKSIZE=1024
          CONFIG_TASK_SPAWN_DEFAULT_STACKSIZE=2048
-         CONFIG_BUILTIN_PROXY_STACKSIZE=1024
          CONFIG_NSH_TELNETD_DAEMONSTACKSIZE=2048
          CONFIG_NSH_TELNETD_CLIENTSTACKSIZE=2048
 
diff --git a/boards/arm/tiva/tm4c1294-launchpad/README.txt b/boards/arm/tiva/tm4c1294-launchpad/README.txt
index a09845b89b..099ea85f0a 100644
--- a/boards/arm/tiva/tm4c1294-launchpad/README.txt
+++ b/boards/arm/tiva/tm4c1294-launchpad/README.txt
@@ -64,7 +64,6 @@ Where <subdir> is one of the following:
          CONFIG_PTHREAD_STACK_DEFAULT=2048
          CONFIG_POSIX_SPAWN_PROXY_STACKSIZE=1024
          CONFIG_TASK_SPAWN_DEFAULT_STACKSIZE=2048
-         CONFIG_BUILTIN_PROXY_STACKSIZE=1024
          CONFIG_NSH_TELNETD_DAEMONSTACKSIZE=2048
          CONFIG_NSH_TELNETD_CLIENTSTACKSIZE=2048