diff --git a/jOOQ-meta/src/main/java/org/jooq/util/h2/H2Database.java b/jOOQ-meta/src/main/java/org/jooq/util/h2/H2Database.java
index 945535282a..4b6240692d 100644
--- a/jOOQ-meta/src/main/java/org/jooq/util/h2/H2Database.java
+++ b/jOOQ-meta/src/main/java/org/jooq/util/h2/H2Database.java
@@ -244,6 +244,9 @@ public class H2Database extends AbstractDatabase {
                 .from(FUNCTION_ALIASES)
                 .leftOuterJoin(TYPE_INFO)
                 .on(FunctionAliases.DATA_TYPE.equal(TypeInfo.DATA_TYPE))
+                // [#1256] TODO implement this correctly. Not sure if POS = 0
+                // is the right predicate to rule out duplicate entries in TYPE_INFO
+                .and(TypeInfo.POS.equal(0))
                 .where(FunctionAliases.ALIAS_SCHEMA.in(getInputSchemata()))
                 .and(FunctionAliases.RETURNS_RESULT.in((short) 1, (short) 2))
                 .orderBy(FunctionAliases.ALIAS_NAME).fetch()) {
diff --git a/jOOQ-test/src/org/jooq/test/h2/F.java b/jOOQ-test/src/org/jooq/test/h2/F.java
index 885cae1990..820036ed3f 100644
--- a/jOOQ-test/src/org/jooq/test/h2/F.java
+++ b/jOOQ-test/src/org/jooq/test/h2/F.java
@@ -124,6 +124,10 @@ public class F {
         return 1000 * p1 + 100 * p2 + p4;
     }
 
+    public static String f1256(String string) {
+        return string;
+    }
+
     public static Integer fNumber(Integer n) {
         return n;
     }
diff --git a/jOOQ-test/src/org/jooq/test/h2/create.sql b/jOOQ-test/src/org/jooq/test/h2/create.sql
index cd5d7a1a3b..3b70b683d5 100644
--- a/jOOQ-test/src/org/jooq/test/h2/create.sql
+++ b/jOOQ-test/src/org/jooq/test/h2/create.sql
@@ -9,6 +9,7 @@ DROP ALIAS IF EXISTS f_author_exists/
 DROP ALIAS IF EXISTS f_one/
 DROP ALIAS IF EXISTS f_number/
 DROP ALIAS IF EXISTS f317/
+DROP ALIAS IF EXISTS f1256/
 DROP ALIAS IF EXISTS p_create_author/
 DROP ALIAS IF EXISTS p_create_author_by_name/
 DROP ALIAS IF EXISTS f_get_one_cursor/
@@ -384,6 +385,7 @@ SELECT * FROM t_book
 CREATE ALIAS f_one FOR "org.jooq.test.h2.F.fOne";/
 CREATE ALIAS f_number FOR "org.jooq.test.h2.F.fNumber";/
 CREATE ALIAS f317 FOR "org.jooq.test.h2.F.f317";/
+CREATE ALIAS f1256 FOR "org.jooq.test.h2.F.f1256";/
 CREATE ALIAS f_arrays1 FOR "org.jooq.test.h2.F.f_arrays1";/
 CREATE ALIAS f_arrays2 FOR "org.jooq.test.h2.F.f_arrays2";/
 CREATE ALIAS f_arrays3 FOR "org.jooq.test.h2.F.f_arrays3";/
diff --git a/jOOQ-test/src/org/jooq/test/h2/generatedclasses/Routines.java b/jOOQ-test/src/org/jooq/test/h2/generatedclasses/Routines.java
index 1c38d273f7..5d7a5b22a9 100644
--- a/jOOQ-test/src/org/jooq/test/h2/generatedclasses/Routines.java
+++ b/jOOQ-test/src/org/jooq/test/h2/generatedclasses/Routines.java
@@ -10,6 +10,44 @@ package org.jooq.test.h2.generatedclasses;
  */
 public final class Routines {
 
+	/**
+	 * Call PUBLIC.F1256
+	 *
+	 * @param p1
+	 * @throws org.jooq.exception.DataAccessException if something went wrong executing the query
+	 */
+	public static java.lang.String f1256(org.jooq.Configuration configuration, java.lang.String p1) {
+		org.jooq.test.h2.generatedclasses.routines.F1256 f = new org.jooq.test.h2.generatedclasses.routines.F1256();
+		f.setP1(p1);
+
+		f.execute(configuration);
+		return f.getReturnValue();
+	}
+
+	/**
+	 * Get PUBLIC.F1256 as a field
+	 *
+	 * @param p1
+	 */
+	public static org.jooq.Field<java.lang.String> f1256(java.lang.String p1) {
+		org.jooq.test.h2.generatedclasses.routines.F1256 f = new org.jooq.test.h2.generatedclasses.routines.F1256();
+		f.setP1(p1);
+
+		return f.asField();
+	}
+
+	/**
+	 * Get PUBLIC.F1256 as a field
+	 *
+	 * @param p1
+	 */
+	public static org.jooq.Field<java.lang.String> f1256(org.jooq.Field<java.lang.String> p1) {
+		org.jooq.test.h2.generatedclasses.routines.F1256 f = new org.jooq.test.h2.generatedclasses.routines.F1256();
+		f.setP1(p1);
+
+		return f.asField();
+	}
+
 	/**
 	 * Call PUBLIC.F317
 	 *
diff --git a/jOOQ-test/src/org/jooq/test/h2/generatedclasses/routines/F1256.java b/jOOQ-test/src/org/jooq/test/h2/generatedclasses/routines/F1256.java
new file mode 100644
index 0000000000..4f3377c11a
--- /dev/null
+++ b/jOOQ-test/src/org/jooq/test/h2/generatedclasses/routines/F1256.java
@@ -0,0 +1,49 @@
+/**
+ * This class is generated by jOOQ
+ */
+package org.jooq.test.h2.generatedclasses.routines;
+
+/**
+ * This class is generated by jOOQ.
+ */
+public class F1256 extends org.jooq.impl.AbstractRoutine<java.lang.String> {
+
+	private static final long serialVersionUID = 588776449;
+
+
+	/**
+	 * An uncommented item
+	 */
+	public static final org.jooq.Parameter<java.lang.String> RETURN_VALUE = createParameter("RETURN_VALUE", org.jooq.impl.SQLDataType.VARCHAR);
+
+	/**
+	 * An uncommented item
+	 */
+	public static final org.jooq.Parameter<java.lang.String> P1 = createParameter("P1", org.jooq.impl.SQLDataType.VARCHAR);
+
+	/**
+	 * Create a new routine call instance
+	 */
+	public F1256() {
+		super("F1256", org.jooq.test.h2.generatedclasses.Public.PUBLIC, org.jooq.impl.SQLDataType.VARCHAR);
+
+		setReturnParameter(RETURN_VALUE);
+		addInParameter(P1);
+	}
+
+	/**
+	 * Set the <code>P1</code> parameter to the routine
+	 */
+	public void setP1(java.lang.String value) {
+		setValue(P1, value);
+	}
+
+	/**
+	 * Set the <code>P1</code> parameter to the function
+	 * <p>
+	 * Use this method only, if the function is called as a {@link org.jooq.Field} in a {@link org.jooq.Select} statement!
+	 */
+	public void setP1(org.jooq.Field<java.lang.String> field) {
+		setField(P1, field);
+	}
+}