diff --git a/src/main/java/org/apache/ibatis/mapping/BoundSql.java b/src/main/java/org/apache/ibatis/mapping/BoundSql.java
index c6f05cda225..3bd249c32d6 100644
--- a/src/main/java/org/apache/ibatis/mapping/BoundSql.java
+++ b/src/main/java/org/apache/ibatis/mapping/BoundSql.java
@@ -45,7 +45,7 @@ public BoundSql(Configuration configuration, String sql, List<ParameterMapping>
     this.sql = sql;
     this.parameterMappings = parameterMappings;
     this.parameterObject = parameterObject;
-    this.additionalParameters = new HashMap<>();
+    this.additionalParameters = new HashMap<>(this.parameterMappings.size());
     this.metaParameters = configuration.newMetaObject(additionalParameters);
   }