diff --git a/src/checkstyle/com/puppycrawl/tools/checkstyle/Configuration.java b/src/checkstyle/com/puppycrawl/tools/checkstyle/Configuration.java
index 5bf1be6bf..a1e22d062 100644
--- a/src/checkstyle/com/puppycrawl/tools/checkstyle/Configuration.java
+++ b/src/checkstyle/com/puppycrawl/tools/checkstyle/Configuration.java
@@ -302,7 +302,7 @@ public class Configuration
 
         for (int i = 0; i < Defn.ALL_BOOLEAN_PROPS.length; i++) {
             final String key = Defn.ALL_BOOLEAN_PROPS[i];
-            retVal.put(key, Boolean.toString(getBooleanProperty(key)));
+            retVal.put(key, String.valueOf(getBooleanProperty(key)));
         }
 
         for (int i = 0; i < Defn.ALL_PATTERN_PROPS.length; i++) {