diff --git a/src/GUI/Makefile.am b/src/GUI/Makefile.am
index e78139c6f..4f2a55dd3 100644
--- a/src/GUI/Makefile.am
+++ b/src/GUI/Makefile.am
@@ -14,6 +14,7 @@ libGUI_a_SOURCES = \
 	trackball.c trackball.h \
 	puList.cxx puList.hxx \
 	AirportList.cxx AirportList.hxx \
+        property_list.cxx property_list.hxx \
         layout.cxx layout-props.cxx layout.hxx
 
 INCLUDES = -I$(top_srcdir) -I$(top_srcdir)/src