diff --git a/app/CalypAppModuleIf.h b/app/CalypAppModuleIf.h
index a9a8580..7d0d49a 100644
--- a/app/CalypAppModuleIf.h
+++ b/app/CalypAppModuleIf.h
@@ -30,6 +30,10 @@
 #include <cstdio>
 #include <iostream>
 
+#ifdef CALYP_THREADED_MODULES
+#include <QThread>
+#endif
+
 #include "CommonDefs.h"
 #include "ModuleHandleDock.h"
 #include "config.h"