diff --git a/samples/nanokernel/apps/grove_lcd/Makefile b/samples/nanokernel/apps/grove_lcd/Makefile
index d3a3e4fa07..795c836dbb 100644
--- a/samples/nanokernel/apps/grove_lcd/Makefile
+++ b/samples/nanokernel/apps/grove_lcd/Makefile
@@ -1,6 +1,5 @@
 BOARD ?= arduino_101_sss
-ARCH ?= arc
 KERNEL_TYPE = nano
-CONF_FILE = prj_$(ARCH).conf
+CONF_FILE = prj.conf
 
 include ${ZEPHYR_BASE}/Makefile.inc
diff --git a/samples/nanokernel/apps/grove_lcd/prj_x86.conf b/samples/nanokernel/apps/grove_lcd/prj.conf
similarity index 100%
rename from samples/nanokernel/apps/grove_lcd/prj_x86.conf
rename to samples/nanokernel/apps/grove_lcd/prj.conf
diff --git a/samples/nanokernel/apps/grove_lcd/prj_arc.conf b/samples/nanokernel/apps/grove_lcd/prj_arc.conf
deleted file mode 100644
index d1a353749c..0000000000
--- a/samples/nanokernel/apps/grove_lcd/prj_arc.conf
+++ /dev/null
@@ -1,8 +0,0 @@
-CONFIG_STDOUT_CONSOLE=y
-CONFIG_PRINTK=y
-
-CONFIG_I2C=y
-
-CONFIG_GROVE=y
-CONFIG_GROVE_LCD_RGB=y
-CONFIG_GROVE_LCD_RGB_INIT_PRIORITY=90
diff --git a/samples/nanokernel/apps/i2c_fujitsu_fram/Makefile b/samples/nanokernel/apps/i2c_fujitsu_fram/Makefile
index d3a3e4fa07..795c836dbb 100644
--- a/samples/nanokernel/apps/i2c_fujitsu_fram/Makefile
+++ b/samples/nanokernel/apps/i2c_fujitsu_fram/Makefile
@@ -1,6 +1,5 @@
 BOARD ?= arduino_101_sss
-ARCH ?= arc
 KERNEL_TYPE = nano
-CONF_FILE = prj_$(ARCH).conf
+CONF_FILE = prj.conf
 
 include ${ZEPHYR_BASE}/Makefile.inc
diff --git a/samples/nanokernel/apps/i2c_fujitsu_fram/prj_x86.conf b/samples/nanokernel/apps/i2c_fujitsu_fram/prj.conf
similarity index 100%
rename from samples/nanokernel/apps/i2c_fujitsu_fram/prj_x86.conf
rename to samples/nanokernel/apps/i2c_fujitsu_fram/prj.conf
diff --git a/samples/nanokernel/apps/i2c_fujitsu_fram/prj_arc.conf b/samples/nanokernel/apps/i2c_fujitsu_fram/prj_arc.conf
deleted file mode 100644
index 9332f6ef86..0000000000
--- a/samples/nanokernel/apps/i2c_fujitsu_fram/prj_arc.conf
+++ /dev/null
@@ -1,3 +0,0 @@
-CONFIG_STDOUT_CONSOLE=y
-CONFIG_PRINTK=y
-CONFIG_I2C=y