--- a/geowebcache/core/src/main/java/org/geowebcache/GeoWebCacheEnvironment.java
+++ b/geowebcache/core/src/main/java/org/geowebcache/GeoWebCacheEnvironment.java
@@ -178,7 +178,7 @@ public <T> Optional<T> resolveValueIfEnabled(final String value, Class<T> type)
         } else if (type.isAssignableFrom(Boolean.class)) {
             if (!validateBoolean(resultValue))
                 throw new IllegalArgumentException("Illegal String parameter: Resolved value is not a boolean.");
-            Boolean boolValue = Boolean.valueOf(value);
+            Boolean boolValue = Boolean.valueOf(resultValue);
             return (Optional<T>) Optional.of(boolValue);
         }