diff --git a/src/main/java/eu/hbp/mip/controllers/GroupsApi.java b/src/main/java/eu/hbp/mip/controllers/GroupsApi.java
index 289624981a5e8f3c596ed5ae90a85169986fe891..8bdba0cc9a6e02578dbfa56b773ad12b9ce11642 100644
--- a/src/main/java/eu/hbp/mip/controllers/GroupsApi.java
+++ b/src/main/java/eu/hbp/mip/controllers/GroupsApi.java
@@ -53,7 +53,8 @@ public class GroupsApi {
     }
 
     private String loadGroups() {
-        String sqlQuery = String.format("SELECT * FROM meta_variables where target_table='%s'", featuresMainTable);
+        String sqlQuery = String.format(
+                "SELECT * FROM meta_variables where target_table='%s'", featuresMainTable.toUpperCase());
         SqlRowSet data = metaJdbcTemplate.queryForRowSet(sqlQuery);
         data.next();
         String json = ((PGobject) data.getObject("hierarchy")).getValue();
diff --git a/src/main/java/eu/hbp/mip/controllers/VariablesApi.java b/src/main/java/eu/hbp/mip/controllers/VariablesApi.java
index e08e0d19f61d093f4c9b4c198d1c06df07d728a9..b52344c7a811050e76b177b855e5a99ae18c32d4 100644
--- a/src/main/java/eu/hbp/mip/controllers/VariablesApi.java
+++ b/src/main/java/eu/hbp/mip/controllers/VariablesApi.java
@@ -124,7 +124,8 @@ public class VariablesApi {
     )  {
         LOGGER.info("Get groups and variables hierarchy");
 
-        String sqlQuery = String.format("SELECT * FROM meta_variables where target_table='%s'", featuresMainTable);
+        String sqlQuery = String.format(
+                "SELECT * FROM meta_variables where target_table='%s'", featuresMainTable.toUpperCase());
         SqlRowSet data = metaJdbcTemplate.queryForRowSet(sqlQuery);
         data.next();
         String json = ((PGobject) data.getObject("hierarchy")).getValue();
@@ -136,7 +137,8 @@ public class VariablesApi {
 
 
     private List<String> loadVariables() {
-        String sqlQuery = String.format("SELECT * FROM meta_variables where target_table='%s'", featuresMainTable);
+        String sqlQuery = String.format(
+                "SELECT * FROM meta_variables where target_table='%s'", featuresMainTable.toUpperCase());
         SqlRowSet data = metaJdbcTemplate.queryForRowSet(sqlQuery);
         data.next();
         String json = ((PGobject) data.getObject("hierarchy")).getValue();
diff --git a/tests/meta-db/sql/create.sql b/tests/meta-db/sql/create.sql
index 0e8a944383bf5f2b885a999d8e1e88f016acab48..f15950968b6ee6edefaf1890dfdc7e9b190e943c 100644
--- a/tests/meta-db/sql/create.sql
+++ b/tests/meta-db/sql/create.sql
@@ -42,5 +42,5 @@ INSERT INTO meta_variables (source, hierarchy, target_table) VALUES (
     }]
   }
   ',
-  'features'
+  'FEATURES'
 );