diff --git a/qt/i2pd_qt/DelayedSaveManagerImpl.cpp b/qt/i2pd_qt/DelayedSaveManagerImpl.cpp
index b0c7c4d2..bad6fdb5 100644
--- a/qt/i2pd_qt/DelayedSaveManagerImpl.cpp
+++ b/qt/i2pd_qt/DelayedSaveManagerImpl.cpp
@@ -1,5 +1,7 @@
 #include "DelayedSaveManagerImpl.h"
 
+#include <assert.h>
+
 DelayedSaveManagerImpl::DelayedSaveManagerImpl() :
     widgetToFocus(nullptr),
     saver(nullptr),