diff --git a/tier-0/initramfs.yaml b/tier-0/initramfs.yaml
index de65333..353524c 100644
--- a/tier-0/initramfs.yaml
+++ b/tier-0/initramfs.yaml
@@ -6,13 +6,13 @@ postprocess:
     cat > /usr/lib/dracut/dracut.conf.d/20-bootc-base.conf << 'EOF'
     # We want a generic image; hostonly makes no sense as part of a server side build
     hostonly=no
-    dracutmodules+=" kernel-modules dracut-systemd systemd-initrd base ostree "
+    add_dracutmodules+=" kernel-modules dracut-systemd systemd-initrd base ostree "
     EOF
     cat > /usr/lib/dracut/dracut.conf.d/22-bootc-generic.conf << 'EOF'
     # Extra modules that we want by default that are known to exist in the kernel
-    dracutmodules+=" virtiofs "
+    add_dracutmodules+=" virtiofs "
     EOF
     cat > /usr/lib/dracut/dracut.conf.d/49-bootc-tpm2-tss.conf << 'EOF'
     # We want this for systemd-cryptsetup tpm2 locking
-    dracutmodules+=" tpm2-tss "
+    add_dracutmodules+=" tpm2-tss "
     EOF
diff --git a/tier-1/initramfs-full.yaml b/tier-1/initramfs-full.yaml
index 29e91ee..2c55a83 100644
--- a/tier-1/initramfs-full.yaml
+++ b/tier-1/initramfs-full.yaml
@@ -4,5 +4,5 @@ postprocess:
     #!/usr/bin/env bash
     mkdir -p /usr/lib/dracut/dracut.conf.d
     cat > /usr/lib/dracut/dracut.conf.d/30-bootc-tier-1.conf << 'EOF'
-    dracutmodules+=" lvm crypt fips "
+    add_dracutmodules+=" lvm crypt fips "
     EOF