diff --git a/milkymist-files/data/m1/conf/config.minimal b/milkymist-files/data/m1/conf/config.minimal
index 9ae68a0..cd1250e 100644
--- a/milkymist-files/data/m1/conf/config.minimal
+++ b/milkymist-files/data/m1/conf/config.minimal
@@ -14,6 +14,7 @@ CONFIG_BINFMT_FLAT=y
 CONFIG_lm32=y
 
 CONFIG_TARGET_ROOTFS_EXT4FS=y
+CONFIG_TARGET_ROOTFS_PARTSIZE=4
 
 # CONFIG_BUILD_PATENTED is not set