diff --git a/src/main/java/eu/hbp/mip/utils/ClaimUtils.java b/src/main/java/eu/hbp/mip/utils/ClaimUtils.java
index a169fff572457e326a234d67176f8c6020c269bc..0972bc0a0c99c51b31a2f5fe1c69952f540004c5 100644
--- a/src/main/java/eu/hbp/mip/utils/ClaimUtils.java
+++ b/src/main/java/eu/hbp/mip/utils/ClaimUtils.java
@@ -19,7 +19,7 @@ public class ClaimUtils {
     }
 
     public static String getDatasetClaim(String datasetCode) {
-        return "dataset_" + datasetCode;
+        return "dataset_" + datasetCode.toLowerCase();
     }
 
     public static boolean userHasDatasetsAuthorization(String username, Collection<? extends GrantedAuthority> authorities,