diff --git a/Database/APR/StorageSvc/test/StorageSvc_mtShape_test.cxx b/Database/APR/StorageSvc/test/StorageSvc_mtShape_test.cxx
index 8118565610ce2f87c343f086f43b974fdd962917..edcc2f3e0f4dcc623c5457ea9902b58ae9c662bd 100644
--- a/Database/APR/StorageSvc/test/StorageSvc_mtShape_test.cxx
+++ b/Database/APR/StorageSvc/test/StorageSvc_mtShape_test.cxx
@@ -11,6 +11,7 @@
 #include <sstream>
 #include <iomanip>
 #include <thread>
+#include <set>
 
 using namespace pool;
 using namespace std;