diff --git a/docker-build-nix/action.yaml b/docker-build-nix/action.yaml
index fe936d0..b79ce38 100644
--- a/docker-build-nix/action.yaml
+++ b/docker-build-nix/action.yaml
@@ -87,8 +87,8 @@ runs:
         TARGET_IMAGE="docker://${{ inputs.registry }}/${{ inputs.image-name }}:${{ inputs.image-tag }}"
         echo "Pushing OCI image to: $TARGET_IMAGE"
 
-        # Set TMPDIR to a writable location
-        export TMPDIR="${TMPDIR:-$PWD/tmp}"
+        # Set TMPDIR to a writable location (/tmp should always be writable in containers)
+        export TMPDIR="${TMPDIR:-/tmp}"
         mkdir -p "$TMPDIR"
 
         # Build skopeo command with optional credentials