diff --git a/src/libstore/sqlite.cc b/src/libstore/sqlite.cc
index dd9f10422..41c9f9e7d 100644
--- a/src/libstore/sqlite.cc
+++ b/src/libstore/sqlite.cc
@@ -99,7 +99,7 @@ SQLite::~SQLite()
 void SQLite::isCache()
 {
     exec("pragma synchronous = off");
-    exec("pragma main.journal_mode = truncate");
+    exec("pragma main.journal_mode = wal");
 }
 
 void SQLite::exec(const std::string & stmt)