diff --git a/src/main/java/com/puppycrawl/tools/checkstyle/checks/design/HideUtilityClassConstructorCheck.java b/src/main/java/com/puppycrawl/tools/checkstyle/checks/design/HideUtilityClassConstructorCheck.java
index 8717f9b28..dcf145c57 100644
--- a/src/main/java/com/puppycrawl/tools/checkstyle/checks/design/HideUtilityClassConstructorCheck.java
+++ b/src/main/java/com/puppycrawl/tools/checkstyle/checks/design/HideUtilityClassConstructorCheck.java
@@ -105,7 +105,7 @@ public class HideUtilityClassConstructorCheck extends Check {
     /**
      * Details of class that are required for validation
      */
-    private class Details {
+    private static class Details {
         /** class ast */
         private DetailAST ast;
         /** result of details gathering */