diff --git a/build_image b/build_image
index 1e8f2cd024..e916d0df1b 100755
--- a/build_image
+++ b/build_image
@@ -104,6 +104,7 @@ fi
 . "${BUILD_LIBRARY_DIR}/dev_container_util.sh" || exit 1
 . "${BUILD_LIBRARY_DIR}/test_image_content.sh" || exit 1
 . "${BUILD_LIBRARY_DIR}/vm_image_util.sh" || exit 1
+. "${BUILD_LIBRARY_DIR}/extra_sysexts.sh" || exit 1
 
 PROD_IMAGE=0
 PROD_TAR=0
diff --git a/build_library/extra_sysexts.sh b/build_library/extra_sysexts.sh
new file mode 100644
index 0000000000..d2ace25536
--- /dev/null
+++ b/build_library/extra_sysexts.sh
@@ -0,0 +1,3 @@
+EXTRA_SYSEXTS=(
+  zfs:sys-fs/zfs
+)
diff --git a/build_library/prod_image_util.sh b/build_library/prod_image_util.sh
index 02c0571d09..1251d3a4fe 100755
--- a/build_library/prod_image_util.sh
+++ b/build_library/prod_image_util.sh
@@ -248,10 +248,6 @@ create_prod_tar() {
   upload_image "${container}"
 }
 
-EXTRA_SYSEXTS=(
-  zfs:sys-fs/zfs
-)
-
 create_prod_sysexts() {
   local image_name="$1"
   local image_sysext_base="${image_name%.bin}_sysext.squashfs"