diff --git a/src/Command/SolrIndexing.php b/src/Command/SolrIndexing.php
index 74b7dbb7a822d5085b03a733626872c357db47bb..f72624130d211d08d888fe1b94b3ba5e36cc3e7b 100644
--- a/src/Command/SolrIndexing.php
+++ b/src/Command/SolrIndexing.php
@@ -44,7 +44,7 @@ class SolrIndexing extends Command
         $output->writeln('Start solr indexing.');
         $this->importer->import($server);
         $this->indexer->deleteSolrIndex();
-        $this->indexer->tei2solr();
+        $this->indexer->tei2solr($server);
         $time = microtime(true) - $_SERVER['REQUEST_TIME_FLOAT'];
         $time /= 60;
         $output->writeln('Indexing process completed in '.$time.' minutes.');
diff --git a/src/Index/Indexer.php b/src/Index/Indexer.php
index 85d79a8b38d7d8e2e26df0acfc3db39ef594529a..70e701f67607d4c9c047926c0f3459222b9c3aea 100644
--- a/src/Index/Indexer.php
+++ b/src/Index/Indexer.php
@@ -125,19 +125,21 @@ class Indexer implements IndexerInterface
         $this->teiSampleDir = $teiSampleDir;
     }
 
-    public function tei2solr(): void
+    public function tei2solr(string $server): void
     {
         $this->client->getEndpoint()->setOptions(['timeout' => 60, 'index_timeout' => 60]);
         $finder = new Finder();
         $finder->files()->in($this->teiDir);
 
-        // ===========================================================
-        // Append a sample file which is useful during development.
-        // Remove for production
-        $finderSample = new Finder();
-        $finderSample->files()->in($this->teiSampleDir);
-        $finder->append($finderSample);
-        // ===========================================================
+        if ('dev' === $server) {
+            // ===========================================================
+            // Append a sample file which is useful during development.
+            // Remove for production
+            $finderSample = new Finder();
+            $finderSample->files()->in($this->teiSampleDir);
+            $finder->append($finderSample);
+            // ===========================================================
+        }
 
         foreach ($finder as $file) {
             libxml_use_internal_errors(true);
diff --git a/src/Index/IndexerInterface.php b/src/Index/IndexerInterface.php
index 6e7147e5cf49b89671fc294ec70af7495969230b..1e78ff9ef5cd407fd59aaf1c92f25742a2bb902d 100644
--- a/src/Index/IndexerInterface.php
+++ b/src/Index/IndexerInterface.php
@@ -10,5 +10,5 @@ interface IndexerInterface
 
     public function getTextVersions(string $filePath, array $graphics = []): SolrDocument;
 
-    public function tei2solr(): void;
+    public function tei2solr(string $server): void;
 }