diff --git a/clientgui/Makefile.am b/clientgui/Makefile.am
index c7c9df59e2..05daf1d75d 100644
--- a/clientgui/Makefile.am
+++ b/clientgui/Makefile.am
@@ -54,6 +54,8 @@ boinc_gui_SOURCES = \
     DlgAdvPreferences.cpp \
     DlgAdvPreferencesBase.cpp \
     DlgGenericMessage.cpp \
+    DlgItemProperties.cpp \
+    DlgItemPropertiesBase.cpp \
     DlgOptions.cpp \
     DlgSelectComputer.cpp \
     hyperlink.cpp \