diff --git a/debian/changelog b/debian/changelog
index 53be67a6..eef1bbf9 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+livecd-rootfs (2.642) UNRELEASED; urgency=medium
+
+  * Set uc20 image size to 10G.
+
+ -- Dimitri John Ledkov <xnox@ubuntu.com>  Mon, 10 Feb 2020 12:43:23 +0000
+
 livecd-rootfs (2.641) focal; urgency=medium
 
   * Configure a better nocloud datasource for subiquity cloud-init.
diff --git a/live-build/auto/config b/live-build/auto/config
index 0dcc08ff..436df5fa 100755
--- a/live-build/auto/config
+++ b/live-build/auto/config
@@ -364,6 +364,7 @@ case $IMAGEFORMAT in
 					UBUNTU_IMAGE_ARGS="$UBUNTU_IMAGE_ARGS -c $CHANNEL"
 					;;
 				*)
+					UBUNTU_IMAGE_ARGS="--image-size 10G"
 					# Ubuntu Core 20
 					# Currently uc20 assertions do not support global
 					# channel overrides, instead we have per-channel models