diff --git a/OpenChange/GNUmakefile b/OpenChange/GNUmakefile
index d7b073764..c96f10110 100644
--- a/OpenChange/GNUmakefile
+++ b/OpenChange/GNUmakefile
@@ -92,6 +92,7 @@ $(SOGOBACKEND)_OBJC_FILES += \
 	\
 	MAPIStoreCommonViewsContext.m \
 	MAPIStoreDeferredActionsContext.m \
+	MAPIStoreFallbackContext.m \
 	MAPIStoreFreebusyContext.m \
 	MAPIStoreJournalContext.m \
 	MAPIStoreRemindersContext.m \