diff --git a/src/main/java/com/zaxxer/hikari/HikariConfig.java b/src/main/java/com/zaxxer/hikari/HikariConfig.java
index d1a5d1b8..2e7bb604 100644
--- a/src/main/java/com/zaxxer/hikari/HikariConfig.java
+++ b/src/main/java/com/zaxxer/hikari/HikariConfig.java
@@ -1026,6 +1026,8 @@ public class HikariConfig implements HikariConfigMXBean
             }
          }
       }
+
+      other.sealed = false;
    }
 
    // ***********************************************************************