diff --git a/share/keys/pkgbase-15/trusted/Makefile b/share/keys/pkgbase-15/trusted/Makefile
--- a/share/keys/pkgbase-15/trusted/Makefile
+++ b/share/keys/pkgbase-15/trusted/Makefile
@@ -1,6 +1,7 @@
 PACKAGE=       pkg-bootstrap

-FILES= awskms-15
+FILES= awskms-15 \
+       backup-signing-15

 FILESDIR=      ${SHAREDIR}/keys/pkgbase-15/trusted
 FILESMODE=     644
diff --git a/share/keys/pkgbase-15/trusted/backup-signing-15 b/share/keys/pkgbase-15/trusted/backup-signing-15
new file mode 100644
--- /dev/null
+++ b/share/keys/pkgbase-15/trusted/backup-signing-15
@@ -0,0 +1,2 @@
+function: "sha256"
+fingerprint: "56a77bdcb6c3cf7984729c6138bd5617c24aa0d466b3b604c96205b2c5629f3c"