diff --git a/ci/run-docker.sh b/ci/run-docker.sh
index 726c3c5a7a1c9..5c1985f9b2035 100755
--- a/ci/run-docker.sh
+++ b/ci/run-docker.sh
@@ -44,7 +44,7 @@ run() {
       --volume "$(rustc --print sysroot)":/rust:ro \
       --volume "$(pwd)":/checkout:ro \
       --volume "$(pwd)"/target:/checkout/target \
-      $kvm \
+      "$kvm" \
       --init \
       --workdir /checkout \
       libc \
@@ -76,7 +76,7 @@ build_switch() {
       --volume "$(pwd)":/checkout:ro \
       --volume "$(pwd)"/target:/checkout/target \
       --volume ~/.rustup:/.rustup:Z \
-      $kvm \
+      "$kvm" \
       --init \
       --workdir /checkout \
       libc \