diff --git a/shell.nix b/shell.nix
index 4ff3195..8d31803 100644
--- a/shell.nix
+++ b/shell.nix
@@ -90,7 +90,7 @@ pkgs.mkShell {
       local IMAGE_NAME="dish-planner"
 
       echo "🔨 Building production image..."
-      podman build -f Dockerfile -t ''${REGISTRY}/''${NAMESPACE}/''${IMAGE_NAME}:''${TAG} .
+      podman build --format docker -f Dockerfile -t ''${REGISTRY}/''${NAMESPACE}/''${IMAGE_NAME}:''${TAG} .
       
       echo "✅ Build complete: ''${REGISTRY}/''${NAMESPACE}/''${IMAGE_NAME}:''${TAG}"
       echo "Run 'prod-push' to push to Codeberg"
@@ -119,7 +119,7 @@ pkgs.mkShell {
       local IMAGE_NAME="dish-planner"
 
       echo "🔨 Building production image (no cache)..."
-      podman build --no-cache -f Dockerfile -t ''${REGISTRY}/''${NAMESPACE}/''${IMAGE_NAME}:''${TAG} .
+      podman build --format docker --no-cache -f Dockerfile -t ''${REGISTRY}/''${NAMESPACE}/''${IMAGE_NAME}:''${TAG} .
 
       echo "✅ Build complete: ''${REGISTRY}/''${NAMESPACE}/''${IMAGE_NAME}:''${TAG}"
       echo "Run 'prod-push' to push to Codeberg"