diff --git a/src/main/java/com/samskivert/depot/impl/jdbc/MySQLLiaison.java b/src/main/java/com/samskivert/depot/impl/jdbc/MySQLLiaison.java
index 85c8ea9..4b11fb8 100644
--- a/src/main/java/com/samskivert/depot/impl/jdbc/MySQLLiaison.java
+++ b/src/main/java/com/samskivert/depot/impl/jdbc/MySQLLiaison.java
@@ -23,7 +23,7 @@ public class MySQLLiaison extends BaseLiaison
     public boolean isDuplicateRowException (SQLException sqe)
     {
         String msg = sqe.getMessage();
-        return (msg != null && msg.indexOf("Duplicate entry") != -1);
+        return (sqe.getErrorCode() == 1062) || (msg != null && msg.indexOf("Duplicate entry") != -1);
     }
 
     @Override // from DatabaseLiaison
diff --git a/src/main/java/com/samskivert/depot/impl/jdbc/PostgreSQLLiaison.java b/src/main/java/com/samskivert/depot/impl/jdbc/PostgreSQLLiaison.java
index d061b52..716d5b7 100644
--- a/src/main/java/com/samskivert/depot/impl/jdbc/PostgreSQLLiaison.java
+++ b/src/main/java/com/samskivert/depot/impl/jdbc/PostgreSQLLiaison.java
@@ -21,8 +21,9 @@ public class PostgreSQLLiaison extends BaseLiaison
     // from DatabaseLiaison
     public boolean isDuplicateRowException (SQLException sqe)
     {
-        String msg = sqe.getMessage();
-        return (msg != null && msg.indexOf("duplicate key") != -1);
+        // PostgreSQL duplicate key error code is 23505
+        String state = sqe.getSQLState(), msg = sqe.getMessage();
+        return ("23505".equals(state)) || (msg != null && msg.indexOf("duplicate key") != -1);
     }
 
     // from DatabaseLiaison