diff --git a/configs/sim/udgram/defconfig b/configs/sim/udgram/defconfig
index a328786f27b..641c01ecb99 100644
--- a/configs/sim/udgram/defconfig
+++ b/configs/sim/udgram/defconfig
@@ -597,15 +597,14 @@ CONFIG_EXAMPLES_NSH=y
 # CONFIG_EXAMPLES_USBSERIAL is not set
 # CONFIG_EXAMPLES_USBTERM is not set
 CONFIG_EXAMPLES_UDGRAM=y
-CONFIG_EXAMPLES_UDGRAM_ADDR="/var/fifo/fifo"
+CONFIG_EXAMPLES_UDGRAM_ADDR="/dev/fifo"
 CONFIG_EXAMPLES_UDGRAM_SERVER_APPNAME="server"
 CONFIG_EXAMPLES_UDGRAM_SERVER_STACKSIZE=4096
 CONFIG_EXAMPLES_UDGRAM_SERVER_PRIORITY=100
 CONFIG_EXAMPLES_UDGRAM_CLIENT_APPNAME="client"
 CONFIG_EXAMPLES_UDGRAM_CLIENT_STACKSIZE=4096
 CONFIG_EXAMPLES_UDGRAM_CLIENT_PRIORITY=100
-CONFIG_EXAMPLES_USTREAM=y
-CONFIG_EXAMPLES_USTREAM_ADDR="/var/fifo/fifo"
+# CONFIG_EXAMPLES_USTREAM is not set
 # CONFIG_EXAMPLES_WATCHDOG is not set
 
 #
diff --git a/configs/sim/ustream/defconfig b/configs/sim/ustream/defconfig
index 93504337617..7e453bd1beb 100644
--- a/configs/sim/ustream/defconfig
+++ b/configs/sim/ustream/defconfig
@@ -596,8 +596,9 @@ CONFIG_EXAMPLES_NSH=y
 # CONFIG_EXAMPLES_WEBSERVER is not set
 # CONFIG_EXAMPLES_USBSERIAL is not set
 # CONFIG_EXAMPLES_USBTERM is not set
+# CONFIG_EXAMPLES_UDGRAM is not set
 CONFIG_EXAMPLES_USTREAM=y
-CONFIG_EXAMPLES_USTREAM_ADDR="/var/fifo/fifo"
+CONFIG_EXAMPLES_USTREAM_ADDR="/dev/fifo"
 # CONFIG_EXAMPLES_WATCHDOG is not set
 
 #