diff --git a/build_library/vm_image_util.sh b/build_library/vm_image_util.sh
index 9c4a7b242be..21e4591d8b4 100644
--- a/build_library/vm_image_util.sh
+++ b/build_library/vm_image_util.sh
@@ -187,7 +187,8 @@ IMG_cloudstack_vhd_OEM_SYSEXT=cloudstack
 IMG_digitalocean_OEM_SYSEXT=digitalocean
 
 ## exoscale
-IMG_exoscale_DISK_FORMAT=qcow2
+IMG_exoscale_DISK_FORMAT=exoscale
+IMG_exoscale_DISK_EXTENSION=qcow2
 IMG_exoscale_OEM_SYSEXT=exoscale
 
 ## azure
@@ -477,6 +478,15 @@ _write_qcow2_disk() {
     assert_image_size "$2" qcow2
 }
 
+_write_exoscale_disk() {
+    qemu-img convert -f raw "$1" -O qcow2 -c -o compat=0.10 "$2"
+    # Exoscale images should be exactly 10G. This is the minimum for
+    # Custom Templates, and it also can't be any larger because it
+    # would prevent creation of an instance with the 10G disk size option.
+    qemu-img resize "$2" 10G
+    assert_image_size "$2" qcow2
+}
+
 _write_vhd_disk() {
     qemu-img convert -f raw "$1" -O vpc -o force_size "$2"
     assert_image_size "$2" vpc
diff --git a/changelog/changes/2026-06-06-fix-exoscale-image.md b/changelog/changes/2026-06-06-fix-exoscale-image.md
new file mode 100644
index 00000000000..a68d31a28b4
--- /dev/null
+++ b/changelog/changes/2026-06-06-fix-exoscale-image.md
@@ -0,0 +1 @@
+ - Exoscale: images are now built as 10G .qcow2 so they can be directly used with Exoscale Custom Templates ([scripts#4075](https://github.com/flatcar/scripts/pull/4075))
diff --git a/ci-automation/vms.sh b/ci-automation/vms.sh
index 55a872d6eba..3af954ff0c8 100644
--- a/ci-automation/vms.sh
+++ b/ci-automation/vms.sh
@@ -137,7 +137,7 @@ function _vm_build_impl() {
             COMPRESSION_FORMAT="bz2,none"
         elif [[ "${format}" =~ ^(hyperv|hyperv_vhdx)$ ]];then
             COMPRESSION_FORMAT="zip"
-        elif [[ "${format}" =~ ^(scaleway|kubevirt|proxmoxve|stackit)$ ]];then
+        elif [[ "${format}" =~ ^(scaleway|kubevirt|proxmoxve|stackit|exoscale)$ ]];then
             COMPRESSION_FORMAT="none"
         elif [[ "${format}" =~ ^(akamai)$ ]];then
             COMPRESSION_FORMAT="gz"