diff --git a/build_system.sh b/build_system.sh
index 03c8e31c..2941cdaa 100755
--- a/build_system.sh
+++ b/build_system.sh
@@ -21,7 +21,7 @@ OUT_SKIP_CHUNKS_IMAGE="$OUTPUT_DIR/system-skip-chunks.img"
 
 # the partition is 10G, but openpilot's updater didn't always handle the full size
 # openpilot fix, shipped in 0.9.8 (8/18/24): https://github.com/commaai/openpilot/pull/33320
-ROOTFS_IMAGE_SIZE=5G
+ROOTFS_IMAGE_SIZE=3.7G
 
 # Create temp dir if non-existent
 mkdir -p $BUILD_DIR $OUTPUT_DIR