diff --git a/openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/sql/DBDictionary.java b/openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/sql/DBDictionary.java
index e458af6d4..731c7e887 100644
--- a/openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/sql/DBDictionary.java
+++ b/openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/sql/DBDictionary.java
@@ -3038,7 +3038,7 @@ public class DBDictionary
             return null;
         if (fk.getDeleteAction() == ForeignKey.ACTION_NONE)
             return null;
-        if (fk.isDeferred() && !supportsDeferredConstraints)
+        if (fk.isDeferred() && !supportsDeferredForeignKeyConstraints())
             return null;
         if (!supportsDeleteAction(fk.getDeleteAction())
             || !supportsUpdateAction(fk.getUpdateAction()))
@@ -3075,7 +3075,7 @@ public class DBDictionary
             buf.append(" ON UPDATE ").append(upAction);
         if (fk.isDeferred())
             buf.append(" INITIALLY DEFERRED");
-        if (supportsDeferredConstraints)
+        if (supportsDeferredForeignKeyConstraints())
             buf.append(" DEFERRABLE");
         if (fk.getName() != null
             && CONS_NAME_AFTER.equals(constraintNameMode))
@@ -3083,6 +3083,16 @@ public class DBDictionary
         return buf.toString();
     }
 
+    /**
+     * Whether or not this dictionary supports deferred foreign key constraints.
+     * This implementation returns {@link #supportsUniqueConstraints}.
+     *
+     * @since 1.1.0
+     */
+    protected boolean supportsDeferredForeignKeyConstraints() {
+        return supportsUniqueConstraints;
+    }
+
     /**
      * Return the name of the given foreign key action.
      */
@@ -3151,7 +3161,7 @@ public class DBDictionary
      */
     protected String getUniqueConstraintSQL(Unique unq) {
         if (!supportsUniqueConstraints
-            || (unq.isDeferred() && !supportsDeferredConstraints))
+            || (unq.isDeferred() && !supportsDeferredUniqueConstraints()))
             return null;
 
         StringBuffer buf = new StringBuffer();
@@ -3165,7 +3175,7 @@ public class DBDictionary
             append(")");
         if (unq.isDeferred())
             buf.append(" INITIALLY DEFERRED");
-        if (supportsDeferredConstraints)
+        if (supportsDeferredUniqueConstraints())
             buf.append(" DEFERRABLE");
         if (unq.getName() != null
             && CONS_NAME_AFTER.equals(constraintNameMode))
@@ -3173,6 +3183,16 @@ public class DBDictionary
         return buf.toString();
     }
 
+    /**
+     * Whether or not this dictionary supports deferred unique constraints.
+     * This implementation returns {@link #supportsUniqueConstraints}.
+     *
+     * @since 1.1.0
+     */
+    protected boolean supportsDeferredUniqueConstraints() {
+        return supportsUniqueConstraints;
+    }
+
     /////////////////////
     // Database metadata
     /////////////////////
diff --git a/openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/sql/PostgresDictionary.java b/openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/sql/PostgresDictionary.java
index 9dcc4b362..1ca7f137f 100644
--- a/openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/sql/PostgresDictionary.java
+++ b/openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/sql/PostgresDictionary.java
@@ -271,6 +271,11 @@ public class PostgresDictionary
         return sql;
     }
 
+    protected boolean supportsDeferredUniqueConstraints() {
+        // Postgres only supports deferred foreign key constraints.
+        return false;
+    }
+
     protected String getSequencesSQL(String schemaName, String sequenceName) {
         if (schemaName == null && sequenceName == null)
             return allSequencesSQL;