diff --git a/hack/dockerfiles/test.Dockerfile b/hack/dockerfiles/test.Dockerfile
index 0d2f759c..b3ffdc0b 100644
--- a/hack/dockerfiles/test.Dockerfile
+++ b/hack/dockerfiles/test.Dockerfile
@@ -188,6 +188,7 @@ ENV HOME /home/user
 ENV USER user
 ENV XDG_RUNTIME_DIR=/run/user/1000
 ENV TMPDIR=/home/user/.local/tmp
+ENV BUILDKIT_HOST=unix:///run/user/1000/buildkit/buildkitd.sock
 VOLUME /home/user/.local/share/buildkit
 ENTRYPOINT ["rootlesskit", "buildkitd"]
 
diff --git a/hack/dockerfiles/test.buildkit.Dockerfile b/hack/dockerfiles/test.buildkit.Dockerfile
index 41bac789..2302bd35 100644
--- a/hack/dockerfiles/test.buildkit.Dockerfile
+++ b/hack/dockerfiles/test.buildkit.Dockerfile
@@ -255,6 +255,7 @@ ENV HOME /home/user
 ENV USER user
 ENV XDG_RUNTIME_DIR=/run/user/1000
 ENV TMPDIR=/home/user/.local/tmp
+ENV BUILDKIT_HOST=unix:///run/user/1000/buildkit/buildkitd.sock
 VOLUME /home/user/.local/share/buildkit
 ENTRYPOINT ["rootlesskit", "buildkitd"]