diff --git a/share/examples/oci/Containerfile.pkg b/share/examples/oci/Containerfile.pkg
--- a/share/examples/oci/Containerfile.pkg
+++ b/share/examples/oci/Containerfile.pkg
@@ -15,7 +15,7 @@
 # use for downloading pkg since the freebsd-runtime image has both FreeBSD and
 # FreeBSD-base pkg repo configs installed and FreeBSD-base does not contain the
 # pkg package.
-RUN env ASSUME_ALWAYS_YES=yes pkg bootstrap -r FreeBSD && pkg update
+RUN env ASSUME_ALWAYS_YES=yes sh -c "pkg bootstrap -r FreeBSD && pkg update"
 
 # Install some package(s).
 RUN pkg install -y ${packages}