diff --git a/src/main/java/com/samskivert/depot/impl/PostgreSQLBuilder.java b/src/main/java/com/samskivert/depot/impl/PostgreSQLBuilder.java
index e357b7d..d6ac3c2 100644
--- a/src/main/java/com/samskivert/depot/impl/PostgreSQLBuilder.java
+++ b/src/main/java/com/samskivert/depot/impl/PostgreSQLBuilder.java
@@ -20,6 +20,8 @@
 
 package com.samskivert.depot.impl;
 
+import java.lang.reflect.Field;
+
 import java.sql.Connection;
 import java.sql.SQLException;
 import java.sql.Statement;
@@ -285,6 +287,12 @@ public class PostgreSQLBuilder
         return fm.getColumnType(TYPER, length);
     }
 
+    @Override
+    protected String getSerialType (Field field)
+    {
+        return field.getType().equals(Long.TYPE) ? "BIGSERIAL" : "SERIAL";
+    }
+
     protected static String massageFTQuery (FullText match)
     {
         // The tsearch2 engine takes queries on the form
diff --git a/src/main/java/com/samskivert/depot/impl/SQLBuilder.java b/src/main/java/com/samskivert/depot/impl/SQLBuilder.java
index a0d86f8..57e3110 100644
--- a/src/main/java/com/samskivert/depot/impl/SQLBuilder.java
+++ b/src/main/java/com/samskivert/depot/impl/SQLBuilder.java
@@ -127,7 +127,7 @@ public abstract class SQLBuilder
 
         GeneratedValue genValue = fm.getGeneratedValue();
         if (genValue != null) {
-            maybeMutateForGeneratedValue(genValue, coldef);
+            maybeMutateForGeneratedValue(field, genValue, coldef);
 
         } else if (coldef.defaultValue == null) {
             maybeMutateForPrimitive(field, coldef);
@@ -163,12 +163,13 @@ public abstract class SQLBuilder
         }
     }
 
-    protected void maybeMutateForGeneratedValue (GeneratedValue genValue, ColumnDefinition coldef)
+    protected void maybeMutateForGeneratedValue (
+            Field field, GeneratedValue genValue, ColumnDefinition coldef)
     {
         switch (genValue.strategy()) {
         case AUTO:
         case IDENTITY:
-            coldef.type = "SERIAL";
+            coldef.type = getSerialType(field);
             coldef.unique = true;
             break;
 
@@ -181,6 +182,14 @@ public abstract class SQLBuilder
         }
     }
 
+    /**
+     * The serial type for the field.
+     */
+    protected String getSerialType (Field field)
+    {
+        return "SERIAL";
+    }
+
     /**
      * Returns the boolean literal that corresponds to false.
      */