diff --git a/src/index.cpp b/src/index.cpp
index d1e8af35..0ae9c9f1 100644
--- a/src/index.cpp
+++ b/src/index.cpp
@@ -21,7 +21,7 @@
 #include <sstream>
 
 static Logger& logger = Logger::get();
-static const uint32_t STI_FILE_FORMAT_VERSION = 2;
+static const uint32_t STI_FILE_FORMAT_VERSION = 3;
 
 
 namespace {