diff --git a/Containerfile.nvidia b/Containerfile.nvidia
index f4487511..92b0f6df 100644
--- a/Containerfile.nvidia
+++ b/Containerfile.nvidia
@@ -12,7 +12,7 @@ FROM ${BASE_IMAGE}:${FEDORA_MAJOR_VERSION} AS builder
 ARG FEDORA_MAJOR_VERSION="${FEDORA_MAJOR_VERSION:-39}"
 ARG NVIDIA_MAJOR_VERSION="${NVIDIA_MAJOR_VERSION:-545}"
 ARG KERNEL_FLAVOR="{KERNEL_FLAVOR:-main}"
-ARG RPMFUSION_MIRROR="{RPMFUSION_MIRROR:-}"
+ARG RPMFUSION_MIRROR=""
 
 COPY build*.sh /tmp
 COPY certs /tmp/certs
diff --git a/build-prep.sh b/build-prep.sh
index f66aea22..a98a88b9 100755
--- a/build-prep.sh
+++ b/build-prep.sh
@@ -18,9 +18,13 @@ fi
 mkdir -p /var/lib/alternatives
 
 # enable more repos
+RPMFUSION_MIRROR_RPMS="https://mirrors.rpmfusion.org"
+if [ -n "${RPMFUSION_MIRROR}" ]; then
+    RPMFUSION_MIRROR_RPMS=${RPMFUSION_MIRROR}
+fi
 rpm-ostree install \
-    https://mirrors.rpmfusion.org/free/fedora/rpmfusion-free-release-${RELEASE}.noarch.rpm \
-    https://mirrors.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-${RELEASE}.noarch.rpm \
+    ${RPMFUSION_MIRROR_RPMS}/free/fedora/rpmfusion-free-release-${RELEASE}.noarch.rpm \
+    ${RPMFUSION_MIRROR_RPMS}/nonfree/fedora/rpmfusion-nonfree-release-${RELEASE}.noarch.rpm \
     fedora-repos-archive
 
 if [ -n "${RPMFUSION_MIRROR}" ]; then