diff --git a/docker/alpine/Dockerfile.build b/docker/alpine/Dockerfile.build
index 29212d56..9b052bfc 100644
--- a/docker/alpine/Dockerfile.build
+++ b/docker/alpine/Dockerfile.build
@@ -28,7 +28,7 @@ ENV NODE_ENV=production \
 ENTRYPOINT ["node", "./src/backend/index",  \
   # after a extensive job (like video converting), pigallery calls gc, to clean up everthing as fast as possible
   "--expose-gc", \
-  "--config-path=$CONFIG_FILE"]
+  "--config-path=${CONFIG_FILE}"]
 EXPOSE 80
 RUN apk add --update-cache --repository https://alpine.global.ssl.fastly.net/alpine/v3.11/community/ \
     vips ffmpeg
diff --git a/docker/debian-stretch/Dockerfile.build b/docker/debian-stretch/Dockerfile.build
index d7309a96..bf501a13 100644
--- a/docker/debian-stretch/Dockerfile.build
+++ b/docker/debian-stretch/Dockerfile.build
@@ -26,7 +26,7 @@ ENV NODE_ENV=production \
 ENTRYPOINT ["node", "./src/backend/index",  \
   # after a extensive job (like video converting), pigallery calls gc, to clean up everthing as fast as possible
   "--expose-gc", \
-  "--config-path=$CONFIG_FILE"]
+  "--config-path=${CONFIG_FILE}"]
 EXPOSE 80
 RUN apt-get update && apt-get install -y ffmpeg
 COPY --from=builder /app /app