diff --git a/configs/nitrogen8m_defconfig b/configs/nitrogen8m_defconfig
index a6a9526dee..932ff97ab3 100644
--- a/configs/nitrogen8m_defconfig
+++ b/configs/nitrogen8m_defconfig
@@ -16,6 +16,7 @@ BR2_PACKAGE_HOST_UBOOT_TOOLS_FIT_SUPPORT=y
 # Filesystem
 BR2_TARGET_ROOTFS_EXT2=y
 BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="120M"
 
 # Linux headers same as kernel, a 5.15 series
 BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_15=y
diff --git a/configs/nitrogen8mm_defconfig b/configs/nitrogen8mm_defconfig
index 0130a6a62a..53fbdc3da4 100644
--- a/configs/nitrogen8mm_defconfig
+++ b/configs/nitrogen8mm_defconfig
@@ -16,6 +16,7 @@ BR2_PACKAGE_HOST_UBOOT_TOOLS_FIT_SUPPORT=y
 # Filesystem
 BR2_TARGET_ROOTFS_EXT2=y
 BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="120M"
 
 # Linux headers same as kernel, a 5.15 series
 BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_15=y
diff --git a/configs/nitrogen8mn_defconfig b/configs/nitrogen8mn_defconfig
index 50976959c5..51a0a56140 100644
--- a/configs/nitrogen8mn_defconfig
+++ b/configs/nitrogen8mn_defconfig
@@ -16,6 +16,7 @@ BR2_PACKAGE_HOST_UBOOT_TOOLS_FIT_SUPPORT=y
 # Filesystem
 BR2_TARGET_ROOTFS_EXT2=y
 BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="120M"
 
 # Linux headers same as kernel, a 5.15 series
 BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_15=y
diff --git a/configs/nitrogen8mp_defconfig b/configs/nitrogen8mp_defconfig
index a14a024353..05caae466a 100644
--- a/configs/nitrogen8mp_defconfig
+++ b/configs/nitrogen8mp_defconfig
@@ -16,6 +16,7 @@ BR2_PACKAGE_HOST_UBOOT_TOOLS_FIT_SUPPORT=y
 # Filesystem
 BR2_TARGET_ROOTFS_EXT2=y
 BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="120M"
 
 # Linux headers same as kernel, a 5.15 series
 BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_15=y