diff --git a/plugins/org.jkiss.dbeaver.ext.oracle/src/org/jkiss/dbeaver/ext/oracle/model/OracleStructureAssistant.java b/plugins/org.jkiss.dbeaver.ext.oracle/src/org/jkiss/dbeaver/ext/oracle/model/OracleStructureAssistant.java
index dcc9ab11530001c36565f7fa7b246e77a3fe4ddc..725ef9cfefc1e323653518f05e35aeb1981576d4 100644
--- a/plugins/org.jkiss.dbeaver.ext.oracle/src/org/jkiss/dbeaver/ext/oracle/model/OracleStructureAssistant.java
+++ b/plugins/org.jkiss.dbeaver.ext.oracle/src/org/jkiss/dbeaver/ext/oracle/model/OracleStructureAssistant.java
@@ -287,6 +287,7 @@ public class OracleStructureAssistant implements DBSStructureAssistant
                                     return object;
                                 }
 
+                                @NotNull
                                 @Override
                                 public String getFullyQualifiedName(DBPEvaluationContext context) {
                                     if (objectType == OracleObjectType.SYNONYM && OracleConstants.USER_PUBLIC.equals(schemaName)) {