diff --git a/libretroshare/src/dbase/fimonitor.cc b/libretroshare/src/dbase/fimonitor.cc
index 01d16e128..393186a3c 100644
--- a/libretroshare/src/dbase/fimonitor.cc
+++ b/libretroshare/src/dbase/fimonitor.cc
@@ -1586,7 +1586,7 @@ int FileIndexMonitor::RequestDirDetails(void *ref, DirDetails &details, FileSear
 		details.ref = NULL;
 		details.type = DIR_TYPE_ROOT;
 		details.name = "root";
-		details.hash = "";
+		details.hash.clear() ;
 		details.path = "root";
 		details.age = 0;
 		details.flags.clear() ;
diff --git a/libretroshare/src/dbase/findex.cc b/libretroshare/src/dbase/findex.cc
index 524c57449..4d4581176 100644
--- a/libretroshare/src/dbase/findex.cc
+++ b/libretroshare/src/dbase/findex.cc
@@ -993,7 +993,6 @@ error:
 
 int FileIndex::saveIndex(const std::string& filename, RsFileHash &fileHash, uint64_t &size,const std::set<std::string>& forbidden_dirs)
 {
-	unsigned char sha_buf[SHA_DIGEST_LENGTH];
 	std::string filenametmp = filename + ".tmp" ;
 	std::string s;
 
@@ -1433,7 +1432,7 @@ bool FileIndex::extractData(void *ref,DirDetails& details)
 			details.type = DIR_TYPE_PERSON ;
 		else
 			details.type = DIR_TYPE_DIR;
-		details.hash = "";
+		details.hash.clear() ;
 		details.count = dir->subdirs.size() + dir->files.size();
 		details.min_age = now - dir->most_recent_time ;
 	}
diff --git a/libretroshare/src/dbase/fistore.cc b/libretroshare/src/dbase/fistore.cc
index 3ccc219d9..7c36b392d 100644
--- a/libretroshare/src/dbase/fistore.cc
+++ b/libretroshare/src/dbase/fistore.cc
@@ -263,7 +263,7 @@ int FileIndexStore::RequestDirDetails(void *ref, DirDetails &details, FileSearch
 		details.ref = NULL;
 		details.type = DIR_TYPE_ROOT;
 		details.name = "";
-		details.hash = "";
+		details.hash.clear() ;
 		details.path = "";
 		details.count = indices.size();
 		details.age = 0;
diff --git a/libretroshare/src/serialiser/rsconfigitems.cc b/libretroshare/src/serialiser/rsconfigitems.cc
index 15ac714be..d345c862a 100644
--- a/libretroshare/src/serialiser/rsconfigitems.cc
+++ b/libretroshare/src/serialiser/rsconfigitems.cc
@@ -1479,7 +1479,7 @@ void RsCacheConfig::clear()
 	cachesubid = 0;
 	path = "";
 	name = "";
-	hash = "";
+	hash.clear() ;
 	size = 0;
 	recvd = 0;
 
diff --git a/libretroshare/src/serialiser/rstlvfileitem.cc b/libretroshare/src/serialiser/rstlvfileitem.cc
index a48368e9d..79a2f12f4 100644
--- a/libretroshare/src/serialiser/rstlvfileitem.cc
+++ b/libretroshare/src/serialiser/rstlvfileitem.cc
@@ -43,7 +43,7 @@ RsTlvFileItem::RsTlvFileItem()
 void RsTlvFileItem::TlvClear()
 {
 	filesize = 0;
-	hash = "";
+	hash.clear() ;
 	name.clear();
 	path.clear();
 	pop = 0;