diff --git a/mapstruct-plus-processor/src/main/java/io/github/linpeilie/processor/AutoMapperProperties.java b/mapstruct-plus-processor/src/main/java/io/github/linpeilie/processor/AutoMapperProperties.java
index 65e0804..d85b23d 100644
--- a/mapstruct-plus-processor/src/main/java/io/github/linpeilie/processor/AutoMapperProperties.java
+++ b/mapstruct-plus-processor/src/main/java/io/github/linpeilie/processor/AutoMapperProperties.java
@@ -56,10 +56,10 @@ public class AutoMapperProperties {
     static {
         // load increment mark
         Integer mark = IncrementMarkUtils.incrementAndGet();
-        adapterClassName = adapterClassName + "$" + mark;
-        mapAdapterClassName = mapAdapterClassName + "$" + mark;
-        autoMapperConfigClassName = autoMapperConfigClassName + "$" + mark;
-        autoMapMapperConfigClassName = autoMapMapperConfigClassName + "$" + mark;
+        adapterClassName = adapterClassName + "__" + mark;
+        mapAdapterClassName = mapAdapterClassName + "__" + mark;
+        autoMapperConfigClassName = autoMapperConfigClassName + "__" + mark;
+        autoMapMapperConfigClassName = autoMapMapperConfigClassName + "__" + mark;
     }
 
     public static String getConfigClassName() {