diff --git a/hibernate-core/src/main/java/org/hibernate/dialect/HSQLDialect.java b/hibernate-core/src/main/java/org/hibernate/dialect/HSQLDialect.java
index 69c11d7fd3..bef64fe643 100644
--- a/hibernate-core/src/main/java/org/hibernate/dialect/HSQLDialect.java
+++ b/hibernate-core/src/main/java/org/hibernate/dialect/HSQLDialect.java
@@ -143,6 +143,7 @@ public class HSQLDialect extends Dialect {
 		registerFunction( "reverse", new StandardSQLFunction( "reverse" ) );
 		registerFunction( "space", new StandardSQLFunction( "space", StandardBasicTypes.STRING ) );
 		registerFunction( "str", new SQLFunctionTemplate( StandardBasicTypes.STRING, "cast(?1 as varchar(256))" ) );
+		registerFunction( "to_char", new StandardSQLFunction( "to_char" ) );
 		registerFunction( "rawtohex", new StandardSQLFunction( "rawtohex" ) );
 		registerFunction( "hextoraw", new StandardSQLFunction( "hextoraw" ) );