diff --git a/unprivileged-mainline-slim/Dockerfile b/unprivileged-mainline-slim/Dockerfile
index 795c506..fc19bbc 100644
--- a/unprivileged-mainline-slim/Dockerfile
+++ b/unprivileged-mainline-slim/Dockerfile
@@ -12,4 +12,4 @@ RUN apk -U upgrade \
 COPY --from=git.conorz.at/titanz-containers/hardened_malloc:latest /install /usr/local/lib/
 ENV LD_PRELOAD="/usr/local/lib/libhardened_malloc.so"
 
-USER $UID
+USER nginx
diff --git a/unprivileged-mainline/Dockerfile b/unprivileged-mainline/Dockerfile
index b428061..33ed230 100644
--- a/unprivileged-mainline/Dockerfile
+++ b/unprivileged-mainline/Dockerfile
@@ -12,4 +12,4 @@ RUN apk -U upgrade \
 COPY --from=git.conorz.at/titanz-containers/hardened_malloc:latest /install /usr/local/lib/
 ENV LD_PRELOAD="/usr/local/lib/libhardened_malloc.so"
 
-USER $UID
+USER nginx
diff --git a/unprivileged-stable-slim/Dockerfile b/unprivileged-stable-slim/Dockerfile
index 795c506..fc19bbc 100644
--- a/unprivileged-stable-slim/Dockerfile
+++ b/unprivileged-stable-slim/Dockerfile
@@ -12,4 +12,4 @@ RUN apk -U upgrade \
 COPY --from=git.conorz.at/titanz-containers/hardened_malloc:latest /install /usr/local/lib/
 ENV LD_PRELOAD="/usr/local/lib/libhardened_malloc.so"
 
-USER $UID
+USER nginx
diff --git a/unprivileged-stable/Dockerfile b/unprivileged-stable/Dockerfile
index dd3968d..136c38a 100644
--- a/unprivileged-stable/Dockerfile
+++ b/unprivileged-stable/Dockerfile
@@ -12,4 +12,4 @@ RUN apk -U upgrade \
 COPY --from=git.conorz.at/titanz-containers/hardened_malloc:latest /install /usr/local/lib/
 ENV LD_PRELOAD="/usr/local/lib/libhardened_malloc.so"
 
-USER $UID
+USER nginx