diff --git a/src/index/fsfetcher.h b/src/index/fsfetcher.h
index 8a6ed7e6..ef6c17ac 100644
--- a/src/index/fsfetcher.h
+++ b/src/index/fsfetcher.h
@@ -27,7 +27,7 @@ class FSDocFetcher : public DocFetcher{
     virtual bool fetch(RclConfig* cnf, const Rcl::Doc& idoc, RawDoc& out);
     
     /** Calls stat to retrieve file signature data */
-    virtual bool makesig(RclConfig* cnf, const Rcl::Doc& idoc, string& sig);
+    virtual bool makesig(RclConfig* cnf,const Rcl::Doc& idoc, std::string& sig);
     virtual ~FSDocFetcher() {}
 };