diff --git a/fann-builder/Dockerfile b/fann-builder/Dockerfile
index ad563ae..73d1e0d 100644
--- a/fann-builder/Dockerfile
+++ b/fann-builder/Dockerfile
@@ -3,11 +3,14 @@ FROM alpine:latest
 # Install necessary tools
 RUN apk add --no-cache git build-base
 
-# Create builder user with arguments for UID/GID
-ARG UID=1000
-ARG GID=1000
-RUN addgroup -g $GID builder && \
-    adduser -D -u $UID -G builder builder
+# Create output directory and set proper permissions FIRST
+RUN mkdir -p /home/builder/output && \
+    chmod 777 /home/builder/output
+
+# Create builder user
+RUN adduser -D builder && \
+    chown -R builder:builder /home/builder
+
 USER builder
 WORKDIR /home/builder