diff --git a/openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/sql/SybaseDictionary.java b/openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/sql/SybaseDictionary.java
index 636a8f5c4..272ee64ea 100644
--- a/openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/sql/SybaseDictionary.java
+++ b/openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/sql/SybaseDictionary.java
@@ -131,6 +131,15 @@ public class SybaseDictionary
             "TRAN", "TRIGGER", "TRUNCATE", "TSEQUAL", "UNPARTITION", "USE",
             "USER_OPTION", "WAITFOR", "WHILE", "WRITETEXT",
         }));
+
+        // Sybase does not support foreign key delete/update action NULL, DEFAULT,
+        // CASCADE
+        supportsNullDeleteAction = false;
+        supportsDefaultDeleteAction = false;
+        supportsCascadeDeleteAction = false;
+        supportsNullUpdateAction = false;
+        supportsDefaultUpdateAction = false;
+        supportsCascadeUpdateAction = false;
     }
 
     public int getJDBCType(int metaTypeCode, boolean lob) {