diff --git a/hibernate-core/src/matrix/java/org/hibernate/test/lob/ClobLocatorTest.java b/hibernate-core/src/matrix/java/org/hibernate/test/lob/ClobLocatorTest.java
index 82b320170c..554f6b1072 100644
--- a/hibernate-core/src/matrix/java/org/hibernate/test/lob/ClobLocatorTest.java
+++ b/hibernate-core/src/matrix/java/org/hibernate/test/lob/ClobLocatorTest.java
@@ -32,6 +32,7 @@
 import org.hibernate.testing.RequiresDialectFeature;
 import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;
 import org.hibernate.type.descriptor.java.DataHelper;
+import org.hibernate.dialect.SybaseASE15Dialect;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
@@ -110,25 +111,27 @@ public void testBoundedClobLocatorAccess() throws Throwable {
 		s.close();
 
 		// test empty clob
-		s = openSession();
-		s.beginTransaction();
-		entity = ( LobHolder ) s.get( LobHolder.class, entity.getId() );
-		assertEquals( CLOB_SIZE, entity.getClobLocator().length() );
-		assertEquals( changed, extractData( entity.getClobLocator() ) );
-		entity.setClobLocator( s.getLobHelper().createClob( empty ) );
-		s.getTransaction().commit();
-		s.close();
+		if ( !(getDialect() instanceof SybaseASE15Dialect) ) { // Sybase insert empty string as single space. HHH-6425
+			s = openSession();
+			s.beginTransaction();
+			entity = ( LobHolder ) s.get( LobHolder.class, entity.getId() );
+			assertEquals( CLOB_SIZE, entity.getClobLocator().length() );
+			assertEquals( changed, extractData( entity.getClobLocator() ) );
+			entity.setClobLocator( s.getLobHelper().createClob( empty ) );
+			s.getTransaction().commit();
+			s.close();
 
-		s = openSession();
-		s.beginTransaction();
-		entity = ( LobHolder ) s.get( LobHolder.class, entity.getId() );
-		if ( entity.getClobLocator() != null) {
-			assertEquals( empty.length(), entity.getClobLocator().length() );
-			assertEquals( empty, extractData( entity.getClobLocator() ) );
+			s = openSession();
+			s.beginTransaction();
+			entity = ( LobHolder ) s.get( LobHolder.class, entity.getId() );
+			if ( entity.getClobLocator() != null) {
+				assertEquals( empty.length(), entity.getClobLocator().length() );
+				assertEquals( empty, extractData( entity.getClobLocator() ) );
+			}
+			s.delete( entity );
+			s.getTransaction().commit();
+			s.close();
 		}
-		s.delete( entity );
-		s.getTransaction().commit();
-		s.close();
 
 	}