diff --git a/hibernate-core/src/main/java/org/hibernate/dialect/FirebirdDialect.java b/hibernate-core/src/main/java/org/hibernate/dialect/FirebirdDialect.java
index 3ffe810be8..ddc6a787fe 100644
--- a/hibernate-core/src/main/java/org/hibernate/dialect/FirebirdDialect.java
+++ b/hibernate-core/src/main/java/org/hibernate/dialect/FirebirdDialect.java
@@ -36,7 +36,7 @@ public class FirebirdDialect extends InterbaseDialect {
 	}
 
 	public String getLimitString(String sql, boolean hasOffset) {
-		return new StringBuffer( sql.length() + 20 )
+		return new StringBuilder( sql.length() + 20 )
 				.append( sql )
 				.insert( 6, hasOffset ? " first ? skip ?" : " first ?" )
 				.toString();
diff --git a/hibernate-core/src/main/java/org/hibernate/dialect/InterbaseDialect.java b/hibernate-core/src/main/java/org/hibernate/dialect/InterbaseDialect.java
index 83efc2901e..985fd17fdf 100644
--- a/hibernate-core/src/main/java/org/hibernate/dialect/InterbaseDialect.java
+++ b/hibernate-core/src/main/java/org/hibernate/dialect/InterbaseDialect.java
@@ -98,7 +98,7 @@ public class InterbaseDialect extends Dialect {
 	}
 
 	public String getLimitString(String sql, boolean hasOffset) {
-		return new StringBuffer( sql.length()+15 )
+		return new StringBuilder( sql.length()+15 )
 			.append(sql)
 			.append(hasOffset ? " rows ? to ?" : " rows ?")
 			.toString();