diff --git a/include/osgDB/DatabaseRevisions b/include/osgDB/DatabaseRevisions
index ba33dc144..aff452219 100644
--- a/include/osgDB/DatabaseRevisions
+++ b/include/osgDB/DatabaseRevisions
@@ -35,7 +35,9 @@ class OSGDB_EXPORT FileList : public osg::Object
         FileNames& getFileNames() { return _files; }
         const FileNames& getFileNames() const { return _files; }
 
-        bool contains(const std::string& filename) const { return _files.count(filename)!=0; }
+        bool containsFile(const std::string& filename) const { return _files.count(filename)!=0; }
+
+        void addFile(const std::string& filename) { _files.insert(filename); }
 
         bool removeFile(const std::string& filename);
 
diff --git a/src/osgDB/DatabaseRevisions.cpp b/src/osgDB/DatabaseRevisions.cpp
index ec4715701..9749eda6e 100644
--- a/src/osgDB/DatabaseRevisions.cpp
+++ b/src/osgDB/DatabaseRevisions.cpp
@@ -76,8 +76,8 @@ bool DatabaseRevision::isFileBlackListed(const std::string& filename) const
                          _databasePath.empty() ? 0 : _databasePath.length()+1,
                          std::string::npos);
 
-    return (_filesRemoved.valid() && _filesRemoved->contains(localPath)) ||
-           (_filesModified.valid() && _filesModified->contains(localPath));
+    return (_filesRemoved.valid() && _filesRemoved->containsFile(localPath)) ||
+           (_filesModified.valid() && _filesModified->containsFile(localPath));
 }