diff --git a/src/main/java/life/qbic/io/PetabParser.java b/src/main/java/life/qbic/io/PetabParser.java
index dd2cbf4..dd99656 100644
--- a/src/main/java/life/qbic/io/PetabParser.java
+++ b/src/main/java/life/qbic/io/PetabParser.java
@@ -41,7 +41,7 @@ public PetabMetadata parse(String dataPath) {
           }
           // if we are in the id block, we collect one dataset code per line
           if (inIDBlock) {
-            parseDatasetCode(line).ifPresent(code -> sourcePetabReferences.add(code));
+            parseDatasetCode(line).ifPresent(sourcePetabReferences::add);
           }
           if (line.contains("openBISSourceIds:")) {
             inIDBlock = true;