diff --git a/concat/hterm_resources.concat b/concat/hterm_resources.concat
index 1406a97..ca02fa1 100644
--- a/concat/hterm_resources.concat
+++ b/concat/hterm_resources.concat
@@ -10,4 +10,4 @@
 @resource hterm/concat/date text/plain $ date -u '+%a, %d %b %Y %T %z'
 @resource hterm/changelog/version text/plain $ echo_changelog version
 @resource hterm/changelog/date text/plain $ echo_changelog date
-@resource hterm/git/HEAD text/plain $ echo ${VCSID:-git rev-parse HEAD}
+@resource hterm/git/HEAD text/plain $ echo ${VCSID:-$(git rev-parse HEAD 2>/dev/null)}