diff --git a/boards/arm/stm32/olimex-stm32-p407/configs/kmodule/defconfig b/boards/arm/stm32/olimex-stm32-p407/configs/kmodule/defconfig
index 759b3f903b..5ac29e02b4 100644
--- a/boards/arm/stm32/olimex-stm32-p407/configs/kmodule/defconfig
+++ b/boards/arm/stm32/olimex-stm32-p407/configs/kmodule/defconfig
@@ -5,6 +5,7 @@
 # You can then do "make savedefconfig" to generate a new defconfig file that includes your
 # modifications.
 #
+# CONFIG_FS_REFCOUNT is not set
 CONFIG_ARCH="arm"
 CONFIG_ARCH_BOARD="olimex-stm32-p407"
 CONFIG_ARCH_BOARD_OLIMEX_STM32P407=y
diff --git a/boards/arm/stm32/stm3240g-eval/configs/knxwm/defconfig b/boards/arm/stm32/stm3240g-eval/configs/knxwm/defconfig
index dc2de40c87..1ca39a69d4 100644
--- a/boards/arm/stm32/stm3240g-eval/configs/knxwm/defconfig
+++ b/boards/arm/stm32/stm3240g-eval/configs/knxwm/defconfig
@@ -6,6 +6,7 @@
 # modifications.
 #
 # CONFIG_ARCH_FPU is not set
+# CONFIG_FS_REFCOUNT is not set
 # CONFIG_NXFONTS_DISABLE_16BPP is not set
 # CONFIG_NXTK_DEFAULT_BORDERCOLORS is not set
 # CONFIG_NXWM_NXTERM is not set