diff --git a/scripts/builder.sh b/scripts/builder.sh
index 82289e0..ab86b4d 100644
--- a/scripts/builder.sh
+++ b/scripts/builder.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
-export BUILDKITD_FLAGS=--oci-worker-no-process-sandbox
+if [ -z "$BUILDER_BINARY" ]; then
+    BUILDER_BINARY="${HOME}/builder"
+fi
 
 if [ -z "$EXPORT_REGISTRY" ]; then
     EXPORT_REGISTRY="registry:5000/metacall/builder_cache"
@@ -10,17 +12,20 @@ if [ -z "$IMPORT_REGISTRY" ]; then
     IMPORT_REGISTRY="registry:5000/metacall/builder_cache"
 fi
 
-if [ -z "$BUILDER_BINARY" ]; then
-    BUILDER_BINARY="${HOME}/builder"
-fi
-
 if [ -z "$1" ]; then
     IMAGE_NAME="builder_output"
 else
     IMAGE_NAME="builder_output_$1"
 fi
 
-${BUILDER_BINARY} $@ | buildctl-daemonless.sh build \
+if [ "$(id -u)" -eq 0 ]; then
+    BUILDKIT_COMMAND="buildctl --addr=\"docker-container://metacall_builder_buildkit\" build"
+else
+    export BUILDKITD_FLAGS=--oci-worker-no-process-sandbox
+    BUILDKIT_COMMAND="buildctl-daemonless.sh build"
+fi
+
+${BUILDER_BINARY} $@ | ${BUILDKIT_COMMAND} \
     --export-cache type=registry,ref=${EXPORT_REGISTRY},registry.insecure=true \
     --import-cache type=registry,ref=${IMPORT_REGISTRY},registry.insecure=true \
     --output type=image,name=registry:5000/metacall/${IMAGE_NAME},push=true,registry.insecure=true