diff --git a/apis/filesystem/src/main/java/org/jclouds/filesystem/strategy/internal/FilesystemStorageStrategyImpl.java b/apis/filesystem/src/main/java/org/jclouds/filesystem/strategy/internal/FilesystemStorageStrategyImpl.java
index b51124bc9b..0442c71383 100644
--- a/apis/filesystem/src/main/java/org/jclouds/filesystem/strategy/internal/FilesystemStorageStrategyImpl.java
+++ b/apis/filesystem/src/main/java/org/jclouds/filesystem/strategy/internal/FilesystemStorageStrategyImpl.java
@@ -250,7 +250,7 @@ public class FilesystemStorageStrategyImpl implements LocalStorageStrategy {
    public void clearContainer(String container, ListContainerOptions options) {
       filesystemContainerNameValidator.validate(container);
       // TODO: these require calling removeDirectoriesTreeOfBlobKey
-      checkArgument(options.getDir() == null || options.getPrefix() == null, "cannot specify directory or prefix");
+      checkArgument(options.getDir() == null && options.getPrefix() == null, "cannot specify directory or prefix");
       try {
          File containerFile = openFolder(container);
          File[] children = containerFile.listFiles();