diff --git a/src/db/main-db-p.h b/src/db/main-db-p.h
index 02ebe9cb3..fef0bd127 100644
--- a/src/db/main-db-p.h
+++ b/src/db/main-db-p.h
@@ -29,13 +29,7 @@
 LINPHONE_BEGIN_NAMESPACE
 
 class Content;
-
-struct MessageEventReferences {
-	long eventId;
-	long localSipAddressId;
-	long remoteSipAddressId;
-	long chatRoomId;
-};
+struct MessageEventReferences;
 
 class MainDbPrivate : public AbstractDbPrivate {
 public:
diff --git a/src/db/main-db.cpp b/src/db/main-db.cpp
index d5badd7ea..8df3f068b 100644
--- a/src/db/main-db.cpp
+++ b/src/db/main-db.cpp
@@ -42,6 +42,13 @@ using namespace std;
 
 LINPHONE_BEGIN_NAMESPACE
 
+struct MessageEventReferences {
+	long eventId;
+	long localSipAddressId;
+	long remoteSipAddressId;
+	long chatRoomId;
+};
+
 // -----------------------------------------------------------------------------
 
 MainDb::MainDb () : AbstractDb(*new MainDbPrivate) {}